msem-instigator

Flying
When Reticent Possessor enters the battlefield, you may attach target Aura you control to target permanent or player it could enchant.

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.

Reverent Flame deals 3 damage to target creature. Create three Idol tokens. (They're artifacts with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)

Return target permanent card from your graveyard to your hand. You gain 3 life.

Enchant creature
Enchanted creature can't attack, block, or crew Vehicles.

Shuffle a card from your hand into your library, then draw two cards.

Counter target spell unless its controller pays {1}.
Metamorph {U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up and cast it at any time for its metamorph cost.)

Copy target instant or sorcery spell you control. You may choose new targets for the copy.

This spell costs {2} less to cast and may be cast as though it had flash if an opponent searched their library this turn.
When Ridge Warden enters the battlefield, exile another target nonland permanent with mana value 4 or less until Ridge Warden leaves the battlefield.

Trample
Rift Prowler enters the battlefield with X +1/+1 counters on it, where X is your fealty to Forests. (Each Forest you control counts towards your fealty to Forests.)

Flying
When Rimecraft Owl enters the battlefield, you may put an Aura card with mana value 3 or less from your hand or graveyard onto the battlefield attached to Rimecraft Owl or target creature an opponent controls that Aura could enchant.

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

Destroy target creature. Its controller loses 1 life.

Flying
{U}: Ripclaw Drake gets +1/-1 until end of turn.

Submerge all creature cards in graveyards. (To submerge a card, exile it, then put it on the battlefield face down under its owner's control as a 2/2 creature.)

Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
Madness {1}{G} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Flying
Whenever Rivha and at least two other creatures attack, exile all other attacking creatures you control. For each creature exiled this way, create a 3/3 white Angel creature token with flying that's tapped and attacking.

{2}, {T}: Tap target creature.

Trample
Chosen one ({W}{U}{B}{R}{G}: Transform this permanent.)

{1}{R}: Roaring Dracowyrm gets +2/+0 until end of turn. Activate only once each turn.

Enchant creature
Enchanted creature gets +2/+1 and is a black Zombie in addition to its other colors and types.

Target opponent looks at the top six cards of your library and separates them into a face-down pile and a face-up pile. Choose a pile, then play any number of cards from it without paying their mana costs. Put the rest of the cards into your graveyard.

{1}{G}, {T}, Discard a card: Another target creature you control gets +X/+X until end of turn, where X is 4 minus that creature's power.

When Rotfeeder Slime dies, you gain 2 life for each creature card in your graveyard.

When Rousing Battlehound enters the battlefield, other creatures you control get +1/+1 until end of turn. Other Hounds you control gain first strike until end of turn.