Shock Mouse

Sacrifice this card: Search your library, hand,
and/or graveyard for a card named Thunder
Mouse and put it on the battlefield. Activate
only on your turn and only if you have 8 or
more experience counters.
{r}: Put a shock counter on up to three target
creatures, creatures with Shock counters gain,
"At the beginning of combat on your turn, flip
a coin if the result is heads, this creature cannot
attack this turn."