You can't cast Beastie Beatdown unless you choose a creature you control and a creature an opponent controls as targets.
2024-09-20
If either creature is an illegal target as Beastie Beatdown tries to resolve, the creature you control won't deal damage. If the creature you control is an illegal target, you won't put two +1/+1 counters on it even if you have delirium.
Choose target creature you control and target creature an opponent controls.
Delirium — If there are four or more card types among cards in your graveyard, put two +1/+1 counters on the creature you control.
The creature you control deals damage equal to its power to the creature an opponent controls.
