Ninani, Mother of Ice

+3: Tap two target permanents, they don't untap until Ninani, Mother of Ice leaves the battlefield
-5: Ninani, Mother of Ice deals X damage to any target where X is the total number of tapped permanents on the battlefield
-20: Make an emblem with "at the beginning of your turn create X blue 5/5 flying dragon tokens equal to the number of tapped permanents in play"