Isaac, The Copper Topped

Isaac, The Copper Topped enters the battlefield with {x} +1/+1 counters on it.
When Isaac, The Copper Topped attacks, you may remove half of it's counters rounded up.
If you do, it deals {x} damage to {x} targets.
Each creature that has been dealt damage by Isaac, The Copper Topped after combat loses all activated abilities until your next turn.