Feeder Mice

Vigilance
{b}{t}: Sacrifice Feeder Mice to put 4 +1/+1
counters on target Pet you control, it has
Vigilance. If the target is a Snake put 8 +1/+1 counters on it instead. If the target is a
Legendary Snake you control double the number
of counters on it and it gains 'Whenever this
creature's abilities would trigger the rolling of a
dice, the dice roll automatically succeeds'.