Cleric Beast

Cleric Beast - Whenever Cleric Beast attacks or becomes the target of a spell or ability that would cause it to be healed (even if it hasn’t lost life), put a +1/+1 counter on its.

{ut}: Target an artifact, a enchantment or a sorcery with converted mana cost less than or equal to the number of +1/+1 counters on Cleric Beast. If it is
not under your control it loses all abilities until end
of turn. Destroy it.