On the flip side, you have Mermail Abyssteus , a Level 7 that can discard another WATER monster to Special Summon itself from the hand and tutor a Level 4 or lower Mermail
It is limited by the number of artifacts you control, which you need to tap for its activated ability, but I think thats an excellent design constraint to keep things from getting too degenerate
If the Jeskai route makes the most sense, a 1/1 that should immediately gain you life, and be expendable at the same time fits nicely is a battalion setting
In the beginning, there was Alpha
We've got a pair of giant sea serpents here
Or, call upon heroes who can become summons like Clive, Ifrits Dominant / Ifrit, Warden of Inferno