Number 1: Beseech the Mirror This a tutor that, for not a lot of cost, lets you put the thing you tutored for into play for free
Bidding as Principal - When making a bid, a bidder is accepting personal liability to pay the purchase price, including the buyer's premium, all applicable taxes and all other applicable charges, unless it has been explicitly agreed upon in writing with Matthew Bullock Auctioneers before the commencement of the sale that the bidder is acting as agent on behalf of an identified third party acceptable to Matthew Bullock Auctioneers, and that Matthew Bullock Auctioneers will only look to the principal for payment
While they dont quite make my top 10, I did want to give a shout-out to Magus of the Moon and Containment Priest as cards that do some serious work in the right decks
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Powerful without being broken, The Wandering Emperor rewrote how planeswalkers are allowed to function
Perpetually is fun in the sense that you can have permanent alterations to a card in different zones