msem-instigator

Prevent all damage that would be dealt to you this turn. You gain 1 life for each creature you control.

Whenever you gain life, you may pay {X}, where X is less than or equal to the amount of life you gained. If you do, draw X cards.

When Mass Orator enters the battlefield, if it isn't a token, populate. (Create a token that's a copy of a creature token you control.)
Creature tokens you control get +1/+1.

Flying
Whenever another creature you control attacks, you may pay {1}. If you do, put a +1/+1 counter on it.

[+1]: You gain 1 life. Put a +1/+1 counter on up to one target creature.
[–3]: Exile target creature. Its controller gains life equal to its power.
[–8]: You get an emblem with “Creatures you control get +1/+1 and have double strike and lifelink.”

When Seluriel's Blessing enters the battlefield, put a +1/+1 counter on each creature you control.
Creatures you control enter the battlefield with an additional +1/+1 counter on them.
Creatures you control with counters on them have vigilance and indestructible.

Whenever another creature enters the battlefield, you gain 1 life.

Instant and sorcery spells your opponents cast cost {1} more to cast.

Whenever a creature enters the battlefield under your control, if you didn't cast it from your hand, put a +1/+1 counter on it.
{3}{W}: Exile target creature you control, then return it to the battlefield under its owner's control.

Until end of turn, target creature gets +1/+1 and gains lifelink.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Trained Warhawk enters the battlefield, create a 1/1 white Soldier creature token.

{4}{W}{W}: Create a 4/4 white Angel creature token with flying.
{2}{W}{W}: Populate. (Create a token that's a copy of a creature token you control.)

Defender (This creature can't attack.)
Whenever Wall of Hope is dealt damage, you gain that much life.

Destroy target enchantment, then create a 1/1 white Soldier creature token.

{U}: Aqueous Treader gets +1/-1 until end of turn.
{U}: Aqueous Treader gets -1/+1 until end of turn.

Whenever you cast an instant or sorcery spell, you may pay {1}. If you do, choose one—
• Draw a card, then discard a card.
• Tap target creature.
• Target creature gains flying until end of turn.
• Target player mills two cards.

When Archaeomancer enters the battlefield, return target instant or sorcery card from your graveyard to your hand.

Defender
Discard a card: Barge Engulfer can attack as though it didn't have defender until end of turn.

Counter target spell.

Enchant creature (Target a creature as you cast this. This card enters the battlefield attached to that creature.)
When Cuff Down enters the battlefield, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.

Hexproof (This creature can't be the target of spells or abilities your opponents control.)
As long as an opponent has ten or more cards in their graveyard, Cunning Infiltrator gets +3/+2 and can't be blocked.

Whenever Cutthroat Spy deals combat damage to a player, you may draw a card.

Return target artifact or creature to its owner's hand.