Raichu, Thunder Mouse

Static (Whenever this creature blocks or becomes
blocked, flip a coin. If heads, the opposing creature
becomes paralyzed. A player who controls an
untapped paralyzed creature must flip a coin for that creature at the beginning of each upkeep. If tails, that creature becomes tapped.)
Whenever Raichu, Thunder Mouse attacks, you
may have it deal 3 damage to target creature or planeswalker.