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Relentless Skaabs

As an additional cost to cast this spell, exile a creature card from your graveyard.
Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner’s control with a +1/+1 counter on it.)

Rarity : Uncommon
Types : Creature
SubTypes : Zombie
Artist : Karl Kopinski
Cost converted to mana : 5

Rulings

22 January 2011
When Relentless Skaabs returns to the battlefield because of its undying ability, it’s not being cast. You won’t exile a creature card from your graveyard.
15 April 2013
You must exile exactly one creature card from your graveyard to cast this spell; you cannot cast it without exiling a creature card, and you cannot exile additional creature cards.
15 April 2013
Players can only respond once this spell has been cast and all its costs have been paid. No one can try to otherwise remove the creature card you exiled in order to prevent you from casting this spell.

Sightless Ghoul

Sightless Ghoul can't block. Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Elbrus, the Binding Blade

Equipped creature gets +1/+0. When equipped creature deals combat damage to a player, unattach Elbrus, the Binding Blade, then transform it. Equip {1}