Activated abilities of artifacts your opponents control can't be activated.

+1: Until your next turn, up to one target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value.

−2: You may reveal an artifact card you own from outside the game or choose a face-up artifact card you own in exile. Put that card into your hand.

Whenever a creature you control attacks alone, it gets +X/+X until end of turn, where X is the number of creatures you control.

Armory Guard has vigilance as long as you control a Gate.

Target creature gets +2/+2 until end of turn.

Addendum — If you cast this spell during your main phase, that creature gains flying until end of turn.

When Azorius Arrester enters the battlefield, detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)

When Azorius Justiciar enters the battlefield, detain up to two target creatures your opponents control. (Until your next turn, those creatures can't attack or block and their activated abilities can't be activated.)

Defender

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)

Flying

Creatures can't attack you.

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)

Artifacts and creatures your opponents control enter the battlefield tapped.

Battalion — Whenever Boros Elite and at least two other creatures attack, Boros Elite gets +2/+2 until end of turn.

When Bulwark Giant enters the battlefield, you gain 5 life.

The next 1 damage that would be dealt to target creature this turn is dealt to another target creature instead.

Draw a card.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)

Flying

Put target attacking creature on the bottom of its owner's library. Its controller gains life equal to its toughness.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)

Exile target attacking or blocking creature.

If one or more creature tokens would be created under your control, that many 4/4 white Angel creature tokens with flying and vigilance are created instead.

Create a 1/1 white Bird creature token with flying, then populate. (Create a token that's a copy of a creature token you control.)

Enchant permanent

When Faith's Fetters enters the battlefield, you gain 4 life.

Enchanted permanent can't attack or block, and its activated abilities can't be activated unless they're mana abilities.

Exile each creature you control. Return those cards to the battlefield under their owner's control at the beginning of the next end step.

As long as it's your turn, Gideon Blackblade is a 4/4 Human Soldier creature with indestructible that's still a planeswalker.

Prevent all damage that would be dealt to Gideon Blackblade during your turn.

+1: Up to one other target creature you control gains your choice of vigilance, lifelink, or indestructible until end of turn.

−6: Exile target nonland permanent.

Sacrifice Keening Apparition: Destroy target enchantment.

Battalion — Whenever Makeshift Battalion and at least two other creatures attack, put a +1/+1 counter on Makeshift Battalion.

Afterlife 2 (When this creature dies, create two 1/1 white and black Spirit creature tokens with flying.)

Flying

Whenever another creature or planeswalker you control dies, put a +1/+1 counter on Rising Populace.

Populate. Creatures you control gain indestructible until end of turn. (To populate, create a token that's a copy of a creature token you control.)

Summary Judgment deals 3 damage to target tapped creature.

Addendum — If you cast this spell during your main phase, it deals 5 damage instead.

First strike

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)

Flying

Afterlife 1 (When this creature dies, create a 1/1 white and black Spirit creature token with flying.)

Untap all creatures you control.

Draw a card.

Flying

Lands on the battlefield and land cards in graveyards can't be the targets of spells or abilities your opponents control.

Your opponents can't play land cards from graveyards.

Creatures you control gain indestructible until end of turn.

Addendum — If you cast this spell during your main phase, put a +1/+1 counter on each of those creatures and they gain vigilance until end of turn.

When Urbis Protector enters the battlefield, create a 4/4 white Angel creature token with flying.

Whenever Aetherplasm blocks a creature, you may return Aetherplasm to its owner's hand. If you do, you may put a creature card from your hand onto the battlefield blocking that creature.

If an opponent would mill one or more cards, they mill twice that many cards instead. (To mill a card, a player puts the top card of their library into their graveyard.)

Flying

{U}: Cerulean Sphinx's owner shuffles it into their library.

Flying

Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)

Target player draws three cards. Then that player discards two cards unless they discard a land card.

You may have Copy Enchantment enter the battlefield as a copy of any enchantment on the battlefield.

Return target nonland permanent you don't control to its owner's hand.

Overload {6}{U} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

Target creature you don't control gets -4/-0 until end of turn.

Overload {2}{U} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

Defender (This creature can't attack.)

Flying

Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

At the beginning of your upkeep, scry 1.

{5}{U}: Exchange control of Eyes Everywhere and target nonland permanent. Activate only as a sorcery.

When Fblthp, the Lost enters the battlefield, draw a card. If it entered from your library or was cast from your library, draw two cards instead.

When Fblthp becomes the target of a spell, shuffle Fblthp into its owner's library.

Graft 3 (This creature enters the battlefield with three +1/+1 counters on it. Whenever another creature enters the battlefield, you may move a +1/+1 counter from this creature onto it.)

{1}: Target creature with a +1/+1 counter on it gains flying until end of turn.

Enchant creature

Enchanted creature loses all abilities and has base power and toughness 1/1.

Keymaster Rogue can't be blocked.

When Keymaster Rogue enters the battlefield, return a creature you control to its owner's hand.

When Kiora's Dambreaker enters the battlefield, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)