
Wick, the Whorled Mind | Legendary Creature | Rat Warlock | Whenever Wick or another Rat you control enters, create a 1/1 black Snail creature token if you don't control a Snail. Otherwise, put a +1/+1 counter on a Snail you control.
{U}{B}{R}, Sacrifice a Snail: Wick deals damage equal to the sacrificed creature's power to each opponent. Then draw cards equal to the sacrificed creature's power. | Andrea Piparo
4.5 LSV

Bria, Riptide Rogue | Legendary Creature | Otter Rogue | Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Other creatures you control have prowess. (If a creature has multiple instances of prowess, each triggers separately.)
Whenever you cast a noncreature spell, target creature you control can't be blocked this turn. | Borja Pindado

Alania, Divergent Storm | Legendary Creature | Otter Wizard | Whenever you cast a spell, if it's the first instant spell, the first sorcery spell, or the first Otter spell other than Alania you've cast this turn, you may have target opponent draw a card. If you do, copy that spell. You may choose new targets for the copy. | Joshua Raphael
3.5 LSV

Stormcatch Mentor | Creature | Otter Wizard | Haste
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Instant and sorcery spells you cast cost {1} less to cast. | Manuel Castañón
2.5 LSV

Tempest Angler | Creature | Otter Wizard | Whenever you cast a noncreature spell, put a +1/+1 counter on Tempest Angler. | Raluca Marinescu
2 LSV