Gideon of the Trials goes a long way toward protecting Huatli, Warrior Poet, which can set up some huge attacks when you want to turn the corner
Tap it for mana, and then, if you want to have everyone draw a card, its there, ready to be used
(To mill a card, put the top card of your library into your graveyard.) Legendary Creature - Rat Warlock Ink-Eyes, Servant of Oni Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) Whenever Ink-Eyes deals combat damage to a player, you may put target creature card from that player's graveyard onto the battlefield under your control
The optimal answer here depends on whether you care about the creature you dont want to block attacking you
Rare first edition set cards can also fetch a good price
In Legacy and Modern we see an abundance of U/R combo decks, and the Modern decks might even be interested in playing Temple of Epiphany