Flash (You may cast this spell any time you could cast an instant.)

Flying
Whenever you attack with two or more creatures,
Augment (, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

Enchant creature
Enchanted creature gets +2/+2, has flying, and is a Demon in addition to its other types.
When Inner Demon enters the battlefield, all non-Demon creatures get -2/-2 until end of turn.

For each player, choose friend or foe. Each friend discards all cards from their hand, then draws that many cards plus one. Khorvath's Fury deals damage to each foe equal to the number of cards in their hand.

Spells you cast that refer to artifacts or Contraptions in their rules text cost less to cast.

Whenever Krenko, Tin Street Kingpin attacks, put a +1/+1 counter on it, then create a number of 1/1 red Goblin creature tokens equal to Krenko's power.

Sliver creatures you control have "When this creature enters the battlefield, it deals 1 damage to target player or planeswalker and you gain 1 life."

Flash
Enchant creature
Enchanted creature can't attack or block, and its activated abilities can't be activated.

Enchant creature
Enchanted creature can't attack or block.

Delve (Each card you exile from your graveyard while casting this spell pays for .)
Magmatic Sinkhole deals 5 damage to target creature or planeswalker.

When this creature enters the battlefield, you may draw a card.

Enrage — Whenever Polyraptor is dealt damage, create a token that's a copy of Polyraptor.

Create two 1/1 white Vampire creature tokens with lifelink.

You may play lands from your graveyard.

Flash
Enchant creature
Enchanted creature gets -4/-0.

Whenever an opponent draws a card, that player may pay . If the player doesn't, you create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")

When Sparring Construct dies, put a +1/+1 counter on target creature you control.

, Sacrifice Teacher's Pet: Search your library for a card with augment, combine it with target host you control, then shuffle your library.