The 'What If?' game

[JovialJovian]

Vuel, Outcast of Kondo 2BB
Legendary Planeswalker - Vuel
+2: Create a 2/1 black and red Mercenary creature token.
-X: Search your library for a Mercenary card with mana value X or less and put it onto the battlefield, then shuffle. X can't be more than the number of Mercenaries you control.
-6: Creatures your opponents control lose all abilities and have base power and toughness 0/2 until end of turn.
3

Next:
What if Nahiri had worked with Nissa instead of fighting her?
or
What if the Dusk Legion had gotten to the Immortal Sun first?

[Apellosine]

Elemental Lithoforming wu
Instant (U)
Create an artifact creature token that is a copy of target blocking creature you control that is an Construct Elemental instead of its other types, blocking the same creature.
Sacrifice that token at end of combat.

Next: What if Liliana was able to successfully save her brother from death.
or
What if it was Pia Nalaar that died instead of Kieran.

[lookingupanddown]

Kiran Nalaar 2R
Legendary Creature - Human Artificer
When Kiran Nalaar enters the battlefield, create a 1/1 colorless Thopter artifact creature token with flying.
1R: Target artifact creature deals 1 damage to target creature.
1, Sacrifice an artifact: Target creature you control gains "When this creature dies, it deals 3 damage to target creature or planeswalker."
2/2

Kiran's Revolution 4R
Enchantment
At the beginning of your end step, return target artifact card with mana value X or less from your graveyard to the battlefield, where X is the amount of damage you've dealt this turn.
Kiran's vision sought to burn the corruption deep within the Consulate, and use its flames to reforge the entire system.

Next:
What if Urza became the new Father of Machines?
What if Nahiri went to Ugin on Tarkir instead of looking for Sorin on Innistrad?

[Komandon]

Urza, Father of Machines 3uUU
Legendary Creature - Human Phyrexian Artificer
All creatures, enchantments and lands are artifact in addition to their other types.
Whenever you would activate an ability of an artifact, if it isn't a mana ability, copy that ability. You may choose new targets for that ability. This ability triggers once per turn.
Whenever an opponent would activate the ability of an artifact and isn't a mana ability, counter that ability. This ability triggers once per turn.
3/3

Nahiri, of the Accord 3RW
Legendary Planewalker - Nahiri
As long as it's your turn all planeswalkers with 3 or more loyalty counters and equipped creatures you control are indestructible.
+1 : until end of turn all equipments can equip for 2
-X : deal X damage to each creature and planeswalker.
[4]

Next - What if Alhammarret, the sphinx that trained Jace, had a spark ignited instead of Jace. And Jace was jealous so he kept wiping his masters mind until Alhammarret found out the truth and got revenge.

Or

Urabrask rebellion alliance with Sheoldred was successful and they killed Elesh Norn.

[void_nothing]

Facsimile of Tavoc 3BR
Creature - Phyrexian Horror
First strike, protection from legendary creatures
Legendary creature spells your opponents cast cost 4 life more to cast.
The tipping point in the Phyrexian civil war came when Sheoldred's physical template was united with memories only Urabrask possessed.
4/1

Next: What if Xenagos had killed and replaced Heliod?

Or: What if the siege enchantment cycle from FRF had been Siege battles?

[lookingupanddown]

Palace Siege 3BB
Battle - Siege
(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)
At the beginning of your end step, return target creature card from your graveyard to your hand.
4
//
Silumgar's Ruthlessness
Enchantment
Whenever this card enters the battlefield or at the beginning of your upkeep, each opponent loses 2 life and you gain 2 life.
With his betrayal of Tasigur and alliance with the naga, Silumgar's takeover was complete.

Outpost Siege 3R
Battle - Siege
(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)
Whenever a creature you control leaves the battlefield, Outpost Siege deals 1 damage to any other target.
3
//
Speed of the Horde
Enchantment
Whenever this card enters the battlefield or at the beginning of your upkeep, exile the top card of your library. Until end of turn, you may play that card.
Kolaghan crashed into the cliffs, finally unable to keep up with the Mardu. At long last, the clan is free of the dragons.

Next:
What if Sorin defeated Nahiri?
What if Ugin defeated Nicol Bolas on Tarkir?

[KB52665]

I didn't post in time but I really liked this one.

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Frontier Siege 2g
Battle — Siege
When Frontier Siege enters the battlefield, choose Khans or Dragons.
• Khans — Whenever one or more creatures you control deal combat damage to Frontier Siege, add gg. This mana doesn't empty as steps and phases end.
• Dragons — Whenever a creature with flying enters the battlefield under your control, you may have it deal damage equal to its power to Frontier Siege.
5
/////
Frontier Victory
Sorcery
Choose one —
• Pay any amount of . Create that many 1/1 black Warrior creature tokens with menace and you gain 5 life.
• Create two X/X green Dragon creature tokens with flying and trample, where X is the number of Dragons you control. For each creature token created this way, you may have it fight up to one target creature an opponent controls.

[void_nothing]

Bolas's Nexus {10}
Legendary Artifact
Players can't gain control of permanents other players own, cast cards other players own, or have permanents other players own enter the battlefield under their control.
If a creature would die, instead exile it. Its owner returns it to the battlefield at the beginning of their next upkeep.
If Bolas's Nexus would be put into a graveyard from the battlefield, instead exile it and choose an opponent. You gain control of each creature that opponent controls.

Next: What if Eldraine's courts were bicolor and not monocolor?

Or: What if the Elder Dragon War restarted?