marioguy3, Rithaniel

Mega Evolution XGG
Sorcery (R)
As an additional cost to cast ~ sacrifice a creature.
Search your library for a creature card with mana value equal to X plus the sacrificed creature's mana value and put it onto the battlefield, then shuffle.

void_nothing, Rithaniel Necrochupacabra 1BB Creature - Zombie Beast (R) Descend (If five or more nonland cards are in your graveyard, you get the dead city's blessing for the rest of the game.) When a creature you control dies, if three or more creatures you controlled died this turn, you get the de...

wizyard, void_nothing Repel the Unwanted 1U Instant (U) Descend (If five or more nonland cards are in your graveyard, you get the dead city's blessing for the rest of the game.) If this spell was cast from a graveyard, you get the dead city's blessing for the rest of the game. Return target creature...

netn10, marioguy3 (although with this wording I'm not sure if it would trigger off of itself - I'm assuming that was the intent though) HM: Rithaniel (I like this idea, but I don't really like indestructible on it) Adanto Avenger 1W Creature - Vampire Soldier (C) Descend (If five or more nonland car...

bravelion83, Riria

HM: netn10 (Only thing is I think it's too undercosted)

Stingcreeper 2
Artifact - Equipment (U)
Living Weapon
Equip 4
Equipped creature gets +1/+1 and has infect.

Thoughtstream [sym=U][sym=u] Instant (U) Overflow ( Each card with overflow you include in your deck while deck building increases your minimum deck size by one card .) Draw two cards. I think this mechanic would be more interesting if it made you run something like 2 extra cards in your deck inste...

netn10, wizyard (although I think there are some issues with the execution here, but don't have time to put my thoughts down right now)

Font of Mishra 5
Artifact (R)
T: Each player draws two cards.
Unearth 2

void_nothng, Rithaniel

Corrupted Ring 1
Artifact (R)
T: Add two mana of any combination of colors. Spend this mana only on phyrexian mana costs.

Riria, netn10

Orim's Charm W
Instant (R)
Choose one --
-Players can't cast spells this turn.
-Creatures can't attack this turn.
-Activated abilities that aren't mana abilities can't be activated this turn.

Riria, void_nothing Aboshan's Charm 1U Instant (U) Madness 1U Choose one -- -Counter target spell unless its controller pays 1 . -Return target artifact or enchantment to its owner's hand. -Tap up to two target creatures. The guaranteed initial effect followed by a punisher effect is a good idea IMO...

netn10, Rithaniel

Knight-Steward of Mistmeadow 1WB
Creature - Kithkin Knight (U)
Whenever ~ attacks, choose one --
-Each player draws a card.
-Each player discards a card.
2/3

Riria, void_nothing

Flamekin Vengeant XR
Creature - Elemental (R)
Haste
As ~ enters the battlefield, exile up to twice X instant or sorcery cards from your graveyard. ~ enters the battlefield with a +1/+1 counter for each card exiled this way.
0/0

bravelion83, marioguy3

Take Stock 1U
Instant (C)
If a source an opponent controlled dealt damage to you this turn, ~ costs 1 less to cast.
Scry 2, then draw a card.

wizyard, void_nothing

Decompose 1G
Sorcery (R)
Choose target land. Return a land from your graveyard to the battlefield tapped under the control of that land's controller. If you do, destroy the chosen land.
Draw a card

Not sure if there's a better way to word this one.

bravelion83, void_nothing

Cephalid Jeweler 3UU
Creature - Cephalid Wizard (R)
When ~ enters the battlefield, exchange control of target creature you control and target creature you don't control.
3/3

void_nothing, wizyard (although 1 to equip is likely very abusable)

Fleetform 2UR
Creature - Elemental (R)
Flash, Haste
Evoke UR
1, T: Create a token that's a copy of another target creature that entered the battlefield this turn. Sacrifice the copy when it enters the battlefield.
2/2

wizyard, void_nothing Dovin, Minister of Inspections 1WU Legendary Creature - Vedalken Advisor (R) Vigilance Artifacts you control are clues in addition to their other types and have " 2 , Sacrifice this artifact: Draw a card." When you draw a card, if it's the third card you've drawn this...

I couldn't know that, sorry. You can absolutely still post your own card though, in fact I'd really like to see it. Oh yeah, no worries. Just a "great minds think alike" moment. I'm still going to submit mine but I have to tweak a bunch of things with my card - they're pretty different ex...

Riria, netn10 This is an interesting idea, but the space is very limited because if there are different types of base p/t counters, it would be a nightmare to come up with a system to figure out what should happen if two different ones are on the same creature. And I could be wrong, but if all there...

bravelion83 (dammit I have a "turn things into clues" card on deck but you got there first), wizyard

HM: netn10

Aether Overload 2UU
Sorcery (R)
Double your E.
"In this house we obey the laws of thermondynamics!" -Homer Simpson

emily, Venedrex

HM: netn10 (I just don't like the mana cost)

Phyrexian Slith 1BB
Creature - Phyrexian Slith (R)
Whenever ~ deals combat damage to a player, put an oil counter on it.
~ has toxic X, where X is the number of oil counters on it.
2/2

bravelion83, emily

Kamahl's Ritual 1R
Instant (U)
Add RRR. If this spell was cast from a graveyard, add three mana in any combination of colors instead.
Flashback 2G

Riria, netn10

Frontier Outpost
Land (R)
T: Add C.
T: Add one mana of any color. Activate this ability only on an opponent's turn.

SurgingChaos, emily

Critical Mass 3UU
Sorcery (R)
Proliferate
Storm

wizyard, marioguy3 (I'm assuming it's supposed to be "target creature that player controls"?)

Atog Teeth 1
Artifact - Equipment (U)
Equip 2
Equipped creatures has "Sacrifice an artifact: This creature gets +2/+2 until end of turn."