Since this is one of the few cards in Oath of the Gatewatch that does not make you exile one of your own creatures in order to use the ability, definitely makes this my favourite card for Two-Headed Giant
Bringing this post back from original Ixalan spoilers due to all of the new Enrage stuff (my favorite is Polyraptor)
Don't throw everything you know about it out the window
It perpetually becomes a Phyrexian in addition to its other types
Currently, these two cards mostly see play in Commander, and when looking through EDHRECs usage statistics for these two cards, Guardian Project (139,494 of 1,616,598 eligible decks, or 9%) dwarfs Aurelia (7,660 of 763,421 eligible decks, or 1%) in popularity
They are Vrondiss, Rage of Ancients (a Dragonborn Barbarian, leading the red/green Draconic Rage deck), Prosper, Tome-Bound (a Tiefling Warlock, helming the red/black Planar Portal deck), Sefris of the Hidden Ways (a Genasi Wizard, leading the White/Blue/Black Dungeons of Death deck), and, finally, Galea, Kindler of Hope (a Half-Elf Paladin, topping the White/Blue/Green Aura of Courage deck)
