It has eminently powerful creature types, and has a way to make a whole host of treasure tokens for a low investment
By today's standards it might seem a little slow and clunky, but it's a card drawing machine
I think this gets in the lower range of bomb territory
If you lose control of Yuffie or it leaves the battlefield before its last ability resolves, you won't gain control of the target noncreature artifact
Yenna lets you set up some potentially big plays, copying enchantments like Enchantresss Presence to draw double the cards, or even copying game-warping enchantments like Overwhelming Splendor
When the last is removed, you may cast it without paying its mana cost.) Sorcery Soulfire Eruption Choose any number of target creatures, planeswalkers, and/or players