msem-instigator

Flying
When Percy's Messenger enters, you gain 2 life. You may put a lore counter on a Saga you control.

Lifelink
Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)

Other creatures you control get +0/+1.
Bulwark — {W}: Target creature gains lifelink until end of turn. Activate only if you control a creature with toughness 4 or greater.

{1}{W}: Target creature you control gets +0/+1 until end of turn and assigns combat damage equal to its toughness rather than its power this turn. When that creature deals combat damage to a player this turn, transform Reversal Medic.

When Rice Cultivator enters, search your library for a basic Plains card or an artifact card with a mana ability, reveal it, put it into your hand, then shuffle.

Whenever you cast a spell, you may pay {1}. If you do, put a storage counter on Savings Broker.
Remove X storage counters from Savings Broker: Add {C} for each storage counter removed this way. You gain X life.

When Silkweaver Matron enters, create a white Aura enchantment token named Spinning Silk attached to target creature. The token has enchant creature and “Whenever enchanted creature attacks, tap target creature defending player controls.”
{1}{W}: Untap target enchanted creature.

Flying

Shimmer (Whenever this creature attacks, create a tapped and attacking token that's a copy of it. Exile the token at the beginning of the end step.)

Golden age (If you cast an instant or sorcery spell, activated a nonmana ability, and attacked this turn, enter a renaissance for this game.)
{3}{W}: You gain 1 life.
Sponsor of the Folded Fan gets +2/+0 as long as you're in a renaissance.

Each creature with a law counter on it can't attack or block.
{2}{W}, {T}: Remove all law counters from all permanents, then put a law counter on target creature.

Flying, lifelink

Encourage ({T}: Another target creature you control gets +1/+1 until end of turn. Encourage only as a sorcery.)
Whenever Topan Curemaster encourages a creature, you gain 1 life.

As long as you control three or more artifacts, Treasury Master gets +2/+0 and has slipstream. (This creature can't be blocked as long as only creatures with slipstream are attacking.)

Angel spells you cast cost {1} less to cast.

Warped Recluse can't be blocked by creatures with greater power.
Whenever Warped Recluse attacks and isn't blocked, exile target creature defending player controls. At the beginning of that card's owner's next upkeep, return it to the battlefield under their control.

Flying, lifelink
Creatures entering or leaving the battlefield don't cause abilities to trigger unless that creature is in a pack. (Two or more creatures a player controls with equal power are in a pack.)

When Whiterun Ordainer enters, you gain 4 life.

{T}: Tap target creature. Activate only if Wizened Veteran is embattled. (A creature is embattled if it has a counter on it or a permanent you control attached to it.)

At the beginning of your end step, if you cast no spells this turn, you may return Wrathful Meditant to its owner's hand.

Flash
Rhapsody {5}{U}{U} (Pay {5}{U}{U} to cast this as a 4/4, or once it is in play to make it become a 4/4.)
Animus Channeler's rhapsody cost can be paid any time you could cast an instant.

Flash
Flying
Once during each of your opponent's turns, when you cast a spell, you may pay {1}{U/R}. If you do, copy it. You may choose new targets for the copy. (If it's a permanent spell, the copy becomes a token.)

Flying
Civilized — Whenever Aven Supervisor deals combat damage to a player, if you control an artifact, a creature, and an enchantment, you may draw a card. If you do, discard a card.

Vanguard — Whenever a creature you control attacks alone, it gets +1/+3 until end of turn.