Confusion

Tap target creature & put a -1/-1 counter on it. At its upkeep, flip a coin. On Heads, tap it again and put another -1/-1 counter on it. On Tails, the spell ends.
Upcast: Spend an additional {1} to affect 2 creatures with this spell.
Cat's foot iron claw, Neurosurgeons scream for more,
At paranoia's poison door, Twenty first century schizoid man