The static ability seems really powerful and could be game-breaking in other formats, but I dont see a Legacy archetype that can really harness its power
Karumonix, the Rat King has a similar role but offers a poison wincon instead of extra damage, while format classic Marrow-Gnawer fixes your lack of evasion and can generate a ton of extra bodies even if those tokens wont contribute to or benefit from the Relentless Rats effect
This means, should you have Gorion and Lucky Clover in play, each Adventure spell will trigger Jadzi three times
That's to say nothing of all the original Ravnica block Signets if you want to mess around with those
Give Black Mage Lifelink with White Mages ability, however, and it becomes truly monstrous
(Equipment, Auras you control, and counters are modifications.) Creature - Fox Samurai Ramp (CTRL to add secondary) Removal Plasma Caster Equipped creature gets +1/+1