msem-instigator

Deathtouch, lifelink
Whenever Batwing Initiate deals combat damage to a player, put a +1/+1 counter on it.
Pay 4 life: Batwing Initiate gains flying until end of turn.

Snow Drift enters tapped. When it does, it explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this, then you may put that card into your graveyard.)
{T}: Add {U}.
{4}{U}: Snow Drift becomes an Elemental creature. (This effect lasts indefinitely.)

You may spend mana as though it were mana of any color to cast planeswalker spells.
[–1]: Put a -1/-1 counter on target tapped creature.
[–2]: You gain 2 life for each tapped creature your opponents control.
[–3]: Destroy all creatures that attacked a planeswalker you controlled since your last turn.

Flying
When Scion of Torrents enters, you may return target nonland permanent to its owner's hand.
Whenever an Island you control enters, you may aetherize Scion of Torrents. (To aetherize, create a token that's a copy of it, then exile that token.)

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.”

This spell costs {1} less to cast for each noncreature, nonland permanent you don't control.
When Earthform Pachyderm enters, destroy target noncreature, nonland permanent. Its controller creates a 3/3 green Elephant creature token.

Deathtouch
When Crypt Strider enters, create a 1/1 black Skeleton creature token for each creature card in your graveyard.

Defender (This creature can't attack.)
Whenever you cast a spell, if it isn't your main phase, Serene Meditant loses defender until the beginning of your next end step.

This spell costs {1} less to cast for each card put into your graveyard from anywhere this turn.
Target creature gets -4/-4 until end of turn.

Haste, prowess
Whenever Kamito Warcaster attacks, you may pay {2}{R}. If you do, create a token that's a copy of another target creature you control and that's tapped and attacking. It's a colorless Spirit in addition to its other types. Exile that token at end of combat.

Flash
Whenever you cast a Tale, look at the top two cards of your library. Put one into your hand and the other back on top or into your graveyard.

Enchant creature
Enchanted creature can't attack or block.

Foretell {R} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)
Target attacking creature gets +3/+3 and gains trample until end of turn.

Flying
When Ameret's Favored enters, you gain 3 life.

Put target nonland permanent into its owner's library second from the top.

Ignition Point deals 3 damage to any target.
The next card you cast this turn can be cast as though it has flash.

Alpha (You may have this creature enter with a +1/+1 counter on it. If you do, it becomes alpha and can only attack alone.)
Hexproof

Whenever a creature you control dies, put a legacy counter on Testament to Heroism.
{T}: Add {C}.
{T}, Remove a legacy counter from Testament to Heroism: Add one mana of any color.

Restored Automaton enters with X +1/+1 counters on it.
Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)

Look at the top four cards of your library. You may reveal a noncreature card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

[+1]: Until your next upkeep, creatures can't attack you or planeswalkers you control unless their controller pays {2} for each of those creatures.
[–2]: Look at the top two cards of target player's library. Put any number of them on top of that library and the rest on the bottom in any order.
[–6]: Return all nonland permanents you don't control to their owners' hands.

Equipped creature gets +2/+0 and has haste.
Equip {2}

Explosive Implant deals 4 damage to target creature and 2 damage to that creature's controller.

{T}: Add one mana of any color.
{T}, Sacrifice Elderthrone Shard: Draw a card.