Prior to this, there hadn't been a new type of card in Magic since MTG planeswalkers arrived in 2007, so needless to say, this was a pretty big deal
Personal Rating: C+ + Mills opponent Spell Cards for each monster we tribute + Several easy methods to swarm our field with monsters to tribute + Chainable against removal effects - Cannot use Tokens as tribute - Even with various improvements remains a quite weak effect for its requeriments - Efficiency depends of the opponent's Deck and the cards they mill
Her first ability is a wild one, Nontoken artifacts you control are lands in addition to their other types. This protects your artifacts from many of the most common removal spells in Commander, like Vandalblast, which can only target nonland permanents
If youre interested in an Ixalan-plane Cube, this card at least looks like a staple to me
But Kaiba having to rebuke Moar Cards Guy for it bisects his reaction to Yami playing the card - he's shocked, then coolly defensive of the move, then shocked again