The mutate ability allows you to further utilize Otrimi: because it can be mutated sooner than you could cast it otherwise, it can also attack sooner
#4 Sliver Hivelord This is the source, the line unbroken since the calamity that brought such monsters to our shores. Hastric, Thunian scout Hastric seems to be an expert on the sliver species considering the volume of quotes he has on other sliver cards
Thassa's Oracle A format-warping card in competitive EDH, Thassa's Oracle is a merfolk who also happens to be one of the strongest alternative win cons in Magic: The Gathering
Noxious Gearhulk, Duplicant, Executioner's Capsule Removal
If you cast it at a time a sorcery couldnt be cast, its sacrificed at the end step
I hope this list helped you find that blue tutor you were missing that fits perfectly in your deck build