Krark, the Thumbless

{t}, Sacrifice an artifact: Choose one at random—
• Add {r}{r}{r}.
• Krark deals 3 damage to any target.
• Krark deals 3 damage to himself.
Whenever you flip one or more coins, untap
Krark, the Thumbless.
Krark's luck had left him, but his appetite for recklessness was far from sated.