msem-instigator

When Taken Away enters, target opponent reveals their hand. You choose a nonland card from it and exile that card until Taken Away leaves the battlefield. You may cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any type to cast that spell.

Gestalt (When this or another creature enters under your control, you may merge it with the one in play, keeping counters and attachments. They become the permanent on top plus all abilities from under it.)
Vigilance, lifelink
Whenever an opponent casts a spell, this permanent phases out until end of turn. (Treat it and anything attached to it as though they don't exist until end of turn.)

When Sarrutu Worldbinder enters, create two 1/1 red Elemental creature tokens.
{1}{U}, {T}: Elementals you control gain flying until end of turn.
{2}{R}, {T}: Elementals you control get +2/+0 until end of turn.

Choose one —
• Target creature you control gets +0/+2 and gains hexproof until end of turn.
• Return target nonland permanent to its owner's hand.

Whenever you sacrifice a permanent, Overseer of Armies deals 1 damage to each opponent and each battle they protect.

Haste
{T}: Discard a card, then draw a card.
Paranoia {2}{R} (You may cast this spell for its paranoia cost when a permanent you control leaves the battlefield.)

When Conscious Taboo enters, look at target opponent's hand. You may exile a noncreature, nonland card from it. For as long as that card remains exiled, its owner may play it. A spell cast this way costs {2} more to cast.

Whenever Distracting Performer becomes tapped, you may tap target creature.

This spell costs {2} less to cast if you sacrificed a Clue this turn.
Target player discards two cards.

When Expedition Post enters, create a 1/1 Scout creature token that's all colors.
Creature tokens you control are every creature type.
{4}, {T}: Create a 1/1 Scout creature token that's all colors.

Double strike
Attain {3}{R} ({3}{R}: Transform this. Spend at least three colors of mana to activate this, and only as a sorcery.)

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Lord of Swarms enters or dies, target creature gets -2/-2 until end of turn.

Flash
When Threadspinner enters, untap each enchanted permanent you control. Enchanted creatures you control get +1/+1 until end of turn.

Choose target creature. Scry 3, then reveal the top card of your library. You gain X life and put X +1/+1 counters on that creature, where X is the revealed card's mana value.

Equipped creature gets +3/+1 and has reach.
Equip {4}

Whenever a creature you control dies, you may return all cards that were inscribed onto that creature and all Auras that were attached to that creature to their owners' hands.

Put a +1/+1 counter on target creature. That creature gains first strike until end of turn.
Compose (Then if you cast this from your hand, exile it and create a Saga token with “r3—You may cast a copy of this card from exile without paying its mana cost.”)

Whenever a creature card is put into your graveyard from the battlefield, exile it. You lose life equal to that card's mana value. Put it onto the battlefield tapped at the beginning of your next upkeep.

Whenever Withering Husk enters or attacks, you may discard a card and pay 1 life. If you do, draw a card, then each opponent loses 1 life.
Recite {R} (You may cast this creature from your graveyard for its recite cost. If you do, exile it when it enters or if it would leave the battlefield.)

Enchant creature
When Bramble Armor enters, put a +1/+1 counter on enchanted creature.
{G}, Sacrifice Bramble Armor: Enchanted creature gains indestructible end of turn. Tap it.

Whenever Toxic Lurker attacks, you may have target creature defending player controls get -2/-1 until end of turn.

Escalate {1}{W} (Pay this cost for each mode chosen beyond the first.)
Choose one or both —
• Return up to two target creature cards from your graveyard to your hand.
• Abound, abound. (To abound, you may cast a spell that costs less than this from your hand without paying its mana cost.)

Search your library for up to thirteen cards, exile them, then shuffle.
Draw three cards.

Choose two —
• Create two 1/1 white Soldier creature tokens.
• Creatures you control get +1/+1 until end of turn.
• You gain 5 life.
• Choose a creature. It gains indestructible until end of turn.

If you would put one or more counters on a creature you control or on yourself, put that many plus one of each of those kinds of counters on that creature or player instead.
{2}{G}{U}, Sacrifice Triton's Invocation: Draw cards equal to the greatest number of counters among creatures you control and yourself.