Sliver Hivelord [Mystery Booster] Nightmare Horse then that player shuffles their

then that player shuffles their hand into their library

including the possibility of a Borderless Mythic Rare card from Magic's history

It is the glimpse of a new horizon beyond the hills

As long as The Wandering Emperor entered the battlefield this turn

exile up to one target nonland permanent

Sliver Hivelord [Mystery Booster] Nightmare Horse then that player shuffles theirSet: Mystery Booster Type: Legendary Creature Sliver Rarity: Mythic Cost: {W}{U}{B}{R}{G} Sliver creatures you control have indestructible. (Damage and effects that say "destroy" don't destroy them.) "This is the source, the line unbroken since the calamity that brought such monsters to our shores." Hastric, Thunian scout