Zinney, shrewd tinkerer

When Zinney, shrewd experimentor or another creature enters the battlefield under your control,
you may pay {x}. If you do, then put X
experimental counters among 1, 2, or 3 creatures.
When Zinney, shrewd experimentor attacks, flip
a coin for each experimental counter on creatures
on the battlefield. For each tails, the creature that
the experimental counter was on gets +2/-3, and
for each heads, the creature that the experimental counter was on gains flying, first strike, and+2/-2.