Den Protector [Dragons of Tarkir Prerelease Promos] Ritual/Spirit/Effect Monster if the equipped monster attacked:

if the equipped monster attacked: Target 1 Spell/Trap Card on the field

Whenever an opponent searches their library

You cannot Normal or Special Summon monsters the turn you activate this card

Set: Kaladesh Type: Artifact Creature — Assembly-Worker Rarity: Common Cost: {5} When Self-Assembler enters the battlefield

create a 1/1 black Assassin creature token with deathtouch and haste

Den Protector [Dragons of Tarkir Prerelease Promos] Ritual/Spirit/Effect Monster if the equipped monster attacked:Set: Dragons of Tarkir Prerelease Promos Type: Creature Human Warrior Rarity: Rare Cost: {1}{G} Creatures with power less than Den Protector's power can't block it. Megamorph {1}{G} (You may cast this card face down as a 2 2 creature for {3}. Turn it face up any time for its megamorph cost and put a +1 +1 counter on it.) When Den Protector is turned face up, return target card from your graveyard to your hand.