Hideaway 4 Watcher for Tomorrow enters the battlefield tapped. When Watcher for Tomorrow leaves the battlefield, put the exiled card into its owner's hand.
Enchant creature When Winter's Rest enters the battlefield, tap enchanted creature. As long as you control another snow permanent, enchanted creature doesn't untap during its controller's untap step.
Menace At the beginning of your precombat main phase, you may sacrifice a creature. When you do, choose a nonland card name, then target player reveals their hand and discards all cards with that name.
{B}: Endling gains menace until end of turn. {B}: Endling gains deathtouch until end of turn. {B}: Endling gains undying until end of turn. {1}: Endling gets +1/-1 or -1/+1 until end of turn.
If it's not your turn, you may exile a black card from your hand rather than pay this spell's mana cost. Destroy all creatures that entered the battlefield this turn.