msem-instigator

Siphon (Each -1/-1 counter you put on your creatures up to their remaining toughness while casting this pays for {1}.)
Draw X cards, where X is the greatest power among creatures you control. Then you may put a permanent card with mana value X or less from your hand onto the battlefield.

As long as Ajani Enlightened has an odd or even number of loyalty counters on him, he has protection from mana values of that quality.
[+1]: Any number of players may draw a card. You may put a loyalty counter on Ajani Enlightened for each opponent that does.
[0]: You gain 2 life. Untap up to two target lands.
[–8]: Create a 5/5 white Avatar creature token with protection from odd mana values and a 5/5 white Avatar creature token with protection from even mana values.

Glitch {2} (Remove one [restriction] for each time you pay the glitch cost.)
Target creature gets +3/+3 until end of turn [if it has trample]. Then put a trample counter on that creature.

Flash
Flying

Kaneh Temple enters tapped.
Satrapies you control have “{T}: Add {B} or {R}.”

Glitch {2} (Remove one [restriction] for each time you pay the glitch cost.)
Create a 3/2 red creature token named Error with trample and haste. [Exile it at the beginning of the next end step.]

Attacking creatures get +3/+0 until end of turn.

Whenever Yrodu, the Lotus Ablaze attacks, eight target permanents don't untap during their controller's next untap step.
Whenever Yrodu blocks a creature, destroy that creature at end of combat.

Put target permanent card from your graveyard on top of your library.

When target creature you control dies this turn, return that card to the battlefield tapped. Put two +1/+1 counters on it. It becomes renowned.

Draw a card, then forebode. (Create a tapped colorless Omen artifact token with “{T}, Discard a card, Sacrifice this artifact: Draw a card.”)

Target creature you control gets +X/+X until end of turn, where X is the number of lands you control.

Neblus' Legacy enters tapped.
When Neblus' Legacy enters, you may mill two cards.
{T}: Add {G} or {U}.

Rhapsody {5}{W}{W} (Pay {5}{W}{W} to cast this as a 4/4, or as a sorcery to make it become a 4/4.)
When Kan's Faithful enters, exile up to one target nonland permanent with mana value X or less until Kan's Faithful leaves the battlefield, where X is Kan's Faithful's power.

Whenever a player casts a spell, that player reveals cards from the top of their library until they reveal two land cards, then puts all cards revealed this way into their graveyard.

When Savagery Evergrowing enters, create two 3/2 green Horror creature tokens.
Whenever a Horror you control dies, put a +1/+1 counter on each Horror you control.

Spirited (When this creature enters, you may activate one of its activated abilities without paying its cost.)
{3}{B}{B}: Choose any number of other nontoken creatures you control. Whenever one of those creatures dies this turn, create a token that's a copy of that creature, except it has no mana cost.

Tap target creature. Prevent all damage that would be dealt to and dealt by that creature this turn.

Menace (This creature can't be blocked except by two or more creatures.)
Whenever Maddened Elk attacks, it gets +1/+1 until end of turn for each other attacking creature you control.

When Ethereal Spellmaster enters, if it was cast, you may search your library for an instant or sorcery card with mana value 3 or less and cast it without paying its mana cost. If you do, shuffle your library. (If it has X in its mana cost, X is 0.)

Menace
Whenever Searing Sandwurm is dealt damage, it deals that much damage to target player or planeswalker.

Flying
{U}: Put Cloud Sovereign on top of its owner's library.
Foresee — As you draw Cloud Sovereign, you may reveal it and pay {1}{W}. When you do, create a 1/1 white Bird creature token with flying.

{1}, {T}, Sacrifice Stolen Strain: Target creature gains lifelink until end of tun.
{1}, {T}, Sacrifice Stolen Strain: Target creature gains winnow until end of turn. (Damage dealt to it also causes its controller to lose that much life.)

Flying
Whenever you cast an instant or sorcery spell from your hand, you may cast an instant or sorcery card with mana value less than or equal to that spell's mana value from your graveyard without paying its mana cost. Exile that card instead of putting it into your graveyard as it resolves.