msem-instigator

Haste
Whenever Rapid Rodent attacks, it gets +1/+0 until end of turn for each other creature you control with flash and/or haste.

Flying

Target nonland permanent phases out. (Treat it and anything attached to it as though they don't exist until its controller's next turn.)
Draw a card.

You gain 3 life.
Draw a card.

Flying
Whenever Revived Pterosaur deals combat damage to an opponent, that player discards a card.
{4}{B}{B}, Discard two cards: Return Revived Pterosaur from your graveyard to the battlefield tapped.

Whenever Roaring Illusion attacks alone, for each other creature you control, create a token that's a copy of that creature and that's tapped and attacking. Exile those tokens at the beginning of the next end step.

When Rocket Admin enters, you may pay 3 life. When you do, gain control of target creature or planeswalker with mana value 3 or less until its owner pays {3}.

If a creature an opponent controls would die, exile it instead.
Whenever Rocket Poacher deals combat damage to a player, put a card exiled with it onto the battlefield under your control.

Flying
If a +1/+1 counter would be put on a creature you control, you may instead put your choice of a flying counter, a vigilance counter, or a trample counter on it.

{T}: Add {C}.
{T}: Add {C} for each six cards in your graveyard.

({T}: Add {B} or {R}.)
Ruined Shrine enters tapped unless you control two or more basic lands.

Target creature phases out. (Treat it and anything attached to it as though they don't exist until its controller's next turn.)

Whenever Rustshell Mantis is dealt damage, put that many +1/+1 counters on it. (It must survive the damage to get the counters.)

Whenever another creature with power 4 or greater you control attacks, Ruthless Brawler deals 1 damage to defending player.

Return target creature or land card from your graveyard to your hand. You may shuffle up to three cards from your graveyard into your library.

Enchant creature
Enchanted creature has vigilance.
Whenever enchanted creature attacks or blocks, you gain 2 life.

[+2]: Draw a card, then discard a card unless you pay {2}.
[+1]: Target creature gets +1/+1 and gains lifelink until your next turn.
[–1]: Tap target permanent. It doesn't untap during its controller's next untap step.
[–2]: Return target artifact, enchantment, or tapped creature to its owner's hand.

Flying
Whenever Sandslinger attacks, you may tap target creature if you've gained life this turn.

Harness (You may tap a creature you control as you cast this spell. If you do, reduce this spell's mana cost by that creature's power.)
Target creature gets -X/-X until end of turn.

At the beginning of your upkeep, if six or more cards are in your graveyard, you may transform Scuttling Gnat.

Flash
{U}, Sacrifice Seal of Approval: Counter target spell unless its controller pays {2}.

Harness (You may tap a creature you control as you cast this spell. If you do, reduce this spell's mana cost by that creature's power.)
Return up to two target cards from your graveyard to your hand. Exile Secret Stash.

Whenever Ser Wayver, the Broken Hour attacks, each opponent loses 2 life and you gain that much life.
When Ser Wayver dies or is countered, exile it with three time counters on it and it gains suspend. (At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast this card without paying its mana cost. It has haste.)

Shadow Ball deals 2 damage to target creature or planeswalker and 2 damage to its controller. You gain 2 life.

Target creature phases out. Its controller sacrifices a creature. (Treat the phased out creature and anything attached to it as though they don't exist until its controller's next turn.)