Slithice, Naga Siren

Whenever a creature you control attacks, put a Rip
Tide counter on Slithice, Naga Siren.
When Slithice, Naga Siren has 6 or more Rip Tide counters, remove all Rip Tide counters, all creatures
you control get +2/+0 and gain trample until end of
turn.
{t}: Create a 3/4 Blue Naga Siren Illusion creature
token. Activate this ability only when there are less
than 3 tokens created this way on the battlefield.