berserk mtg card Target creature gains trample and gets +X/+0 until end of turn Berserk - Magic the Gathering

I dont think the token youre going to give your opponent matters all that much

5 Elesh Norn, Grand Cenobite Elesh Norn is a legendary Phyrexian who appeared more recently in the March of the Machine set, though her original card is still the most famous among all praetor cards

This card also has a nice activated ability for myr typal decks, but I think it still works well even if you dont plan to use its second ability

Theres a deckbuilding challenge here, since you want to mix good activated abilities with ways to pump up Agatha, while also adding enough board presence to make Agathas own activated ability worthwhile