Defense of the Heart [Mystery Booster]Set: 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.

Set: EX: Dragon Type: Colorless Rarity: Holo Rare Retreat cost: Colorless

Set: Amonkhet Invocations Type: Enchantment Rarity: Mythic Cost: {3}{W} If you control a creature

Serendib Efreet deals 1 damage to you

Set: Platinum: Supreme Victors Type: Fire Rarity: Rare Retreat cost: Colorless

Set: Legends Type: Enchantment Rarity: Rare Cost: {2}{W}{W} Creatures without flying can't attack

search your deck for an attack reaction card

but I didn't expect it from the building itself

Set: Sun & Moon: Black Star Promos Type: Lightning Rarity: Black Star Promo Retreat cost: Colorless

Set: POP Series 2 Type: Water Rarity: Rare Retreat cost: Colorless

Set: Portal Second Age Type: Sorcery Rarity: Rare Cost: {U}{U} Until end of turn

Set: XY: Roaring Skies Type: Supporter Rarity: Ultra Rare

Set: Alpha Edition Type: Instant Rarity: Uncommon Cost: {2}{U} Psionic Blast deals 4 damage to any target and 2 damage to you