msem-instigator

Destroy target creature with power 4 or greater.
Create two Idol tokens. (They're artifacts with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)

Flying
If a triggered ability of another permanent you control would trigger for the first time each turn, that ability triggers an additional time.

{T}: Add {C}.
{T}: Add {G}, {U}, or {R}. You can't spend this mana to cast a monocolored spell.

Whenever a creature dies, you may pay 1 life. If you do, draw a card.

Whenever another creature you control dies, target player loses 1 life and you gain 1 life.

Flying
{1}{W}{U}: Submerge another target creature. When An and En, Destined Souls leaves the battlefield, turn that creature face up. (To submerge a card, exile it, then put it on the battlefield face down under its owner's control as a 2/2 creature.)

Breach (Whenever this deals combat damage to a player, you may have it become an Aura Curse until your next turn. Attach it to that player.)
Recursive — As long as Mayar, Nullcrowned is a Curse, they have all nonrecursive abilities of other Curses and creatures with breach you control.
Pay 3 life: Target enchantment creature gains haste and menace until end of turn.

When this creature enters, you may exile target non-Cat creature you control. Return that card to the battlefield under its owner's control at the beginning of the next end step.
Arise {3}{W} ({3}{W}, Exile this from your graveyard as a sorcery: Create a black token copy of it that's also a Zombie and can't block.)

Primal {2}{R} (During your turn, you may cast this spell for {2}{R} instead of playing a land.)
Target creature gets +2/+0 and gains double strike until end of turn.

{T}: Add {C}.
{T}, Sacrifice Shiftscape Canyon: Choose a basic land type other than Plains. Create a colorless land token that's a Plains and the chosen basic land type. Activate only during your upkeep.

Wither (This deals damage to creatures in the form of -1/-1 counters.)
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Equipped creature gets +2/+0 and can't block.
Equip {1}

{T}: Add {C}.
{1}, {T}: Add one mana of any color.

Whenever you cast a noncreature spell, creatures you control get +1/+0 until end of turn.

Draw a card.
Agonize (You may cast this card from your graveyard by putting a -1/-1 counter on a creature you control in addition to paying its other costs. Then exile this card.)

Flash
Flying
When Laughing Bird enters, you may return a creature you control to its owner's hand.

Enchant creature
Enchanted creature gets +2/+2.
Whenever enchanted creature attacks, create a 2/2 white Knight creature token that's tapped and attacking.

{8}: Exile target nonbasic permanent. Its controller gains life equal to its mana value.

Exile two target permanents you control, then return them to the battlefield under your control.

Whenever Student of Winds attacks, upgrade target attacking creature. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Flying

Vigilance
{7}{G}: Molting Linnorm gets +5/+5 and gains trample until end of turn.

If this spell targets a card that was put into a graveyard from the battlefield this turn, you may pay {W} rather that pay its mana cost, and cast it as though it had flash.
Return target creature card from your graveyard to the battlefield.

Enchant creature
At the beginning of combat on your turn, create a token that's a copy of enchanted creature, except it has haste. Exile that token at the beginning of the next end step.

Flying
When Marshcroaker Drake enters, you may return target creature with power 2 or less to its owner's hand.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)