Kril, the Shell-less

When Kril enters the battlefield, reveal the top card
of your library until you reveal a shell card. Put that
card onto the battlefield equipped to Kril. Any
damage dealt to Kril is redirected to the shell
attached to him (excess damage is dealt to Kril).
Whenever a shell is equipped onto Kril, put a +1/+1
counter on Kril. This triggers maximum twice per turn.

You may equip shells on Kril at instant speed. Kril can only have one shell equipped at once.