Fear of Public Speaking

Whenever this creature attacks, until your
next turn, when each opponent casts their first spell, counter that spell unless that player pays {x}, where X is the greatest power among creatures you control.

{4}{u}{u}, Return two Islands you control to
their owner’s hand: Monstrosity 2. (If this
creature isn’t monstrous, put two +1/+1 counters on
it and it becomes monstrous.)