(They have been Kothophed, Soul Hoarder a 6-mana 6/6, and Griselbrand, an 8-mana 7/7
Its certainly one for a more gothic themed winter with the copious amount of blood and seemingly undead Draugr featured in the card
If you need a bit more of a push to maximize your convoke triggers, you can play the Invasion of Segovia, which, when it flips to Caetus, Sea Tyrant of Segovia (a very impressive name for a 3/3 creature), it gives all your noncreature spells convoke, letting you bust out some combat tricks when you're normally tapped out
Youre playing a Temur deck after all, so you should ramp fairly quickly into the requisite 4 mana, and weve got more than a few counterspells to keep them around for a whole rotation
If so, that cuts down on the ambiguity and reduces the potential advantage of the player with the card cheating