Clio, Frog Witch

{1}{u}, {t}: Target creature becomes a blue Frog
with base power and toughness 1/1.
{b}{g}, Tap three untapped Frogs you control:
Put two +1/+1 counters on each Frog creature
you control. Put two -1/-1 counters on each
non-Frog creature you don't control.
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"Play time is over, boys. You're about to see
something else you're probably not ready for."