Could have been a Phyrexian
Creatures (23) 4 Siege Rhino 4 Hangarback Walker 2 Blight Herder 4 Wasteland Strangler 4 Eldrazi Displacer 1 Reality Smasher 4 Thought-Knot Seer Lands (27) Spells (10) Theres a plethora of ways to build Abzan Eldrazi decks, depending on how aggressive you want to be, how synergistic with colorless or Eldrazi or processing you want to be, how planeswalker-heavy (perhaps with Oath of Nissa), how token-based, and how traditional
Understanding how mana abilities work is very important when using these cards, as many of the best colorless cards MTG players can get are mana rocks
Afterlife Insurance is a huge pickup for tokens and aristocrat decks, replacing your tokens with flyers and replacing itself by drawing a card
Additionally, once in play, this four-mana Wizard can help directly deal damage, allowing five untapped Wizards to be tapped to reduce a player's life total by seven