
Mind's Dilation | Enchantment | | Whenever an opponent casts their first spell each turn, that player exiles the top card of their library. If it's a nonland card, you may cast it without paying its mana cost. | Iain McCaig

Drownyard Behemoth | Creature | Eldrazi Crab | Flash (You may cast this spell any time you could cast an instant.)
Emerge {7}{U} (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.)
Drownyard Behemoth has hexproof as long as it entered the battlefield this turn. | Jason Kang

Elder Deep-Fiend | Creature | Eldrazi Octopus | Flash
Emerge {5}{U}{U} (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.)
When you cast this spell, tap up to four target permanents. | Jason Felix

Lashweed Lurker | Creature | Eldrazi Horror | Emerge {5}{G}{U} (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.)
When you cast this spell, you may put target nonland permanent on top of its owner's library. | Igor Kieryluk

Vexing Scuttler | Creature | Eldrazi Crab | Emerge {6}{U} (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.)
When you cast this spell, you may return target instant or sorcery card from your graveyard to your hand. | James Paick

Wretched Gryff | Creature | Eldrazi Hippogriff | Emerge {5}{U} (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.)
When you cast this spell, draw a card.
Flying | Darek Zabrocki