Or, call upon heroes who can become summons like Clive, Ifrits Dominant / Ifrit, Warden of Inferno
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
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
With beautiful illustration cards of the original 151 Pokemon, this is a memorable set to say the least
Upon Synchro Summon, you can add one "World Legacy" card from your deck to hand
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