Defense of the Heart [Mystery Booster] Human Shapeshifter Assassin Underground Mortuary enters the battlefield

Underground Mortuary enters the battlefield tapped

Mirrodin's deepest caverns conceal its brightest hopes

but I can sense some kind of comparable power in this droplet of ancient amber

{3}{G}: Target creature gets +2/+2 until end of turn

target player may put Owen into their hand from their library

Defense of the Heart [Mystery Booster] Human Shapeshifter Assassin Underground Mortuary enters the battlefieldSet: Mystery Booster Type: Enchantment Rarity: Rare Cost: {3}{G} At the beginning of your upkeep, if an opponent controls three or more creatures, sacrifice Defense of the Heart, search your library for up to two creature cards, put those cards onto the battlefield, then shuffle.