Cacophony Unleashed

When Cacophony Unleashed enters, if you cast it, destroy all nonenchantment creatures.
Whenever Cacophony Unleashed or another enchantment you control enters, until end of turn, Cacophony Unleashed becomes a legendary 6/6 Nightmare God creature with menace and deathtouch. It’s still an enchantment.

Gatewatch Beacon

Gatewatch Beacon enters with three loyalty counters on it.
: Add .
Whenever a planeswalker you control enters, if Gatewatch Beacon has loyalty counters on it, you may move a loyalty counter from Gatewatch Beacon onto that planeswalker.

Mindwrack Harpy

Flying
At the beginning of combat on your turn, each player mills three cards.

Gatewatch Beacon

Gatewatch Beacon enters with three loyalty counters on it.
: Add .
Whenever a planeswalker you control enters, if Gatewatch Beacon has loyalty counters on it, you may move a loyalty counter from Gatewatch Beacon onto that planeswalker.

Abbot of Keral Keep

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When Abbot of Keral Keep enters, exile the top card of your library. Until end of turn, you may play that card.

Lupine Prototype

This creature can’t attack or block unless a player has no cards in hand.

Liliana’s Elite

Liliana’s Elite gets +1/+1 for each creature card in your graveyard.

Thraben Foulbloods

Delirium — Thraben Foulbloods gets +1/+1 and has menace as long as there are four or more card types among cards in your graveyard. (A creature with menace can’t be blocked except by two or more creatures.)

Insolent Neonate

Menace (This creature can’t be blocked except by two or more creatures.)
Discard a card, Sacrifice Insolent Neonate: Draw a card.

Veteran Cathar

: Target Human gains double strike until end of turn.

Volt Charge

Volt Charge deals 3 damage to any target. Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Liliana’s Elite

Liliana’s Elite gets +1/+1 for each creature card in your graveyard.

Provoke the Trolls

Provoke the Trolls deals 3 damage to any target. If a creature is dealt damage this way, it gets +5/+0 until end of turn.

Seize the Storm

Create a red Elemental creature token with trample and “This token’s power and toughness are each equal to the number of instant and sorcery cards in your graveyard plus the number of cards with flashback you own in exile.”
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Reckless Fireweaver

Whenever an artifact you control enters, Reckless Fireweaver deals 1 damage to each opponent.

Gearsmith Guardian

Gearsmith Guardian gets +2/+0 as long as you control a blue creature.

Ghitu Amplifier

Kicker (You may pay an additional as you cast this spell.)
When Ghitu Amplifier enters, if it was kicked, return target creature an opponent controls to its owner’s hand.
Whenever you cast an instant or sorcery spell, Ghitu Amplifier gets +2/+0 until end of turn.

Dark-Dweller Oracle

, Sacrifice a creature: Exile the top card of your library. You may play that card this turn. (You still pay its costs. You can play a land this way only if you have an available land play remaining.)