msem-instigator

Choose two —
• You gain 3 life.
• Lost Memories deals 3 damage to any target.
• Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

When Speed Reader enters, harmonize. (Trigger up to one harmony of a permanent you control.)
Harmony — Add {R}{R}.

Put target permanent card from a graveyard onto the battlefield under your control.

({T}: Add {B}, {R}, or {G}.)
Primal Dominion enters tapped.

You may play Volcanic Hollow from your graveyard as long as seven or more cards are in your graveyard.
Volcanic Hollow enters tapped.
{T}: Add {U} or {R}.
Cycling {1}{U}{R} ({1}{U}{R}, Discard this card: Draw a card.)

Whenever a source you control deals damage to a creature or planeswalker an opponent controls, exile that creature or planeswalker.

Each player exiles all permanents they control, draws that many cards, then puts up to that many permanent cards from their hand onto the battlefield. Exile Reform Reality.

When Woopip Wanderer enters, create two colorless artifact tokens named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”
{2}{G}: Germinate. (Put a +1/+1 counter on a creature or create a 1/1 green Saproling creature token.)

Exile the top card of your library. Until end of turn, you may play that card. If that card is an instant or sorcery card, it costs {2} less to cast this turn.

Destroy target non-Xirix permanent. If that permanent had mana value 6 or greater, take an extra turn after this one.

Enchant creature
Enchanted creature gets -X/-X, where X is the number of creature cards in your graveyard.

Creatures you control get +2/+0.
Whenever a creature you control is dealt damage, it deals that much damage to you.

Flying
{3}{R}, {T}: Cloudwing deals 2 damage to target creature. You may tap or untap that creature.

Whenever a creature attacks, if its toughness is greater than its power, untap it.

Rehison Soothemage has lifelink as long as you control another Elf.

Draw two cards, then discard a card unless you have seven or more cards in your graveyard.
Memory {1}{U}{R} (You may cast this card from your graveyard by paying its memory cost and discarding a card. Then exile it.)

{3}{W}{W}: Detain target nonland permanent. (Until your next turn, that permanent can't attack or block and its activated abilities can't be activated.)

Whenever another creature or enchantment you control enters, you gain 1 life.
{3}{W}{W}, Pay 5 life: Castigated Sister becomes a 5/5 Angel Horror with flying. (This effect doesn't end at end of turn.)

When Radiant Rebuker enters, exile target nonland permanent an opponent controls until Radiant Rebuker leaves the battlefield.

Flying
{T}, Tap another untapped creature in Heaven's Gale Harrier's pack: Tap target creature. (Two or more creatures you control with equal power are in a pack.)

Infiltrate (Whenever one or more attacking creatures you control aren't blocked, this creature gets +1/+1 until end of turn.)
When Exiled Warband dies, draw a card.

Deep-Sea Terror can't attack unless seven or more cards are in your graveyard.

Trample
When Arpechian Bellowers enters, harmonize. (Trigger up to one harmony of a permanent you control.)
Harmony — Search your library for a green creature card, reveal it, put it into your hand, then shuffle.

Deathtouch
Unveil {3}{B}{G} ({3}{B}{G}: Transform this. Unveil only as a sorcery.)

Enchant creature
When Crowning Ceremony enters, draw a card.
Enchanted creature gets +1/+0.