Vulshok War Boar [Darksteel]

Vulshok War Boar [Darksteel]Set: Darksteel Type: Creature Boar Beast Rarity: Uncommon Cost: {2}{R}{R} When Vulshok War Boar enters the battlefield, sacrifice it unless you sacrifice an artifact. It must eat its weight in metal daily, or its furnacelike belly will consume itself for lack of fuel.

but none deny that the Mul Daya elves have an iron-strong bond to some force greater than themselves

Set: Eighth Edition Type: Creature — Rhino Beast Rarity: Rare Cost: {4}{G}{G} You may have Rhox assign its combat damage as though it weren't blocked

Sacrifice a creature: Gain control of target creature for as long as you control Helm of Possession and Helm of Possession remains tapped

that creature's controller may search their library for a creature card

Set: Ninth Edition Type: Instant Rarity: Uncommon Cost: {2}{U}{U} Counter target spell

Note the type of mana spent to pay this activation cost

You may put that card onto the battlefield if it's a permanent card with mana value 3 or less

Actions do

{3}{U}{U}: Put Startled Awake from your graveyard onto the battlefield transformed

Return target permanent to its owner's hand

Set: Ixalan Prerelease Promos Type: Creature — Vampire Knight Rarity: Rare Cost: {2}{B}{B} Whenever a Vampire you control attacks

though such a network tends to pull power from nearby devices