Yharnam Pthumerian Queen

Indestructible. When Yharnam enters, all permanents gain Indestructible until the next full turn cycle. At the end of this cycle, Yharnam gets +0/+1 for each creature that had 0 toughness and would have died. When its toughness reaches 0, tap it. It can't untap during your next untap step. When it taps again, it fully regenerates, regaining its toughness and all counters it had.

{t}, {x}, you can only cast less than 3 red mana to activate this ability: It deals X damage to all creatures and gets +1/+0