msem-instigator

At the beginning of your upkeep, you win the game if the total mana value of permanents you control is exactly 21. If it's more than 21, sacrifice Gambling Table and all Card tokens you control. Otherwise, create a colorless Card artifact token with mana cost {2} and “{2}, Sacrifice this artifact: Draw a card.”

Enchant creature
When Karametra's Touch enters, you gain 2 life.
Enchanted creature gets +2/+2.
When enchanted creature dies, return Karametra's Touch to its owner's hand.

Instant, sorcery, and enchantment spells you cast cost {1} less to cast.

When you unveil Tempest Termagant, you may put target land on top of its owner's library.

Meteorain deals 5 damage divided as you choose among any number of target creatures or planeswalkers.

This spell costs {1} less to cast and can't be countered if it targets a cursed opponent.
Target opponent mills eight cards. Exile up to two nonland cards milled this way. Until the end of your next turn, you may cast those cards and mana of any type can be spent to cast those spells.

{G}: Exile target card from a graveyard. You gain 1 life and Purging Watchkeeper gets +1/+1 until end of turn.

Equipped creature gets +2/+0 and can't block.
Equip {1}

Exile up to one target artifact or enchantment.
Coalesce {5}{G} (You may cast this from your graveyard for {5}{G}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)

You can't cast this spell as long as your life total is greater than half your starting life total.
Lifelink
{1}{B}{G}, Discard Death's Widow: Destroy target nonland permanent. You lose life equal to its mana value.

Audition for white. If you create a Role this way, untap the creature it enchants. (Create a 1/1 Construct Actor creature token, a Scout Role giving 2/3 and vigilance, or a Cleric Role giving 2/2 and lifelink. Roles replace older ones.)

Defender
Venerable Loremaster can attack as though it didn't have defender if it's in a pack. (Two or more creatures you control with equal power are in a pack.)

Search your library for an instant or sorcery card, reveal it, put it into your hand, then shuffle.

Anomalion enters with a +1/+1 counter on it.
{1}{G}{W}: Permutate. (You may remove a counter from a creature you control. If you do, put two +1/+1 counters on a different creature you control.)

Each player discards their hand and sacrifices five lands. Cinders of an Old Era deals 5 damage to each creature and planeswalker.
At the beginning of each player's next first main phase, that player draws seven cards and adds five mana in any combination of colors.

Prowess, trample
During your turn, each instant and sorcery card in your graveyard has flashback. The flashback cost is equal to that card's mana cost plus “Pay X life, where X is this card's mana value.”

Flying, menace
Sacrifice a creature: Put two +1/+1 counters on Bloodclaw Demon. It gains indestructible until end of turn.

Advance {2} (Cast this for {2} to advance it as it enters. {2}: Advance this as a sorcery.)
Equipped creature gets +1/+1 for each artifact you control.
Equipped creature must be blocked by an additional creature for each time it and this artifact have advanced this turn to be blocked.
Equip {3}

Each player sacrifices two creatures, then gains 2 life and draws a card for each creature they sacrificed this way.

Counter target creature spell or target spell that targets a creature an opponent controls.

At the beginning of each end step, if a creature you control died this turn, each opponent loses 2 life.
{3}{B}: Target creature you control gains lifelink until end of turn.

No more than two creatures can attack each combat.

Frenzy 1 (Whenever this creature attacks and isn't blocked, it gets +1/+0 until end of turn.)

Whenever you make first contact, Oscuran Wingmate gains flying until end of turn. (You make first contact the first time each turn you cast a spell with a name not in your graveyard or control already.)

When Moonshadow Remnant enters, destroy target tapped creature.
Mirage {3}{W}{W} (You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)