Riptide Noble

At the beginning of your upkeep, put a tide
counter on Riptide Noble.
Remove a tide counter from Riptide Noble:
Create a 1/1 blue Merfolk creature token with hexproof.
{t}: You may put a Merfolk card with converted
mana cost less than or equal to the number of
tide counters on Riptide Noble from your hand
onto the battlefield.