We have not seen that before, but it could prove to be a bit crippling
For one thing, you get seven power and toughness for that five mana, the majority of which has lifelink
Hence, since its debut, massive destruction options, in addition to the limited Dark Hole (don't forget this is OCG I am talking about), cards such as Lightning Vortex and Interrupted Kaiju Slumber have been popular Side Deck options
You will need to sacrifice three monsters
It might be time to revisit some of the Ayara, First of Locthwain decks I pitched early in Kaldheim preview season since all these black creatures trigger the drain ability with Awaken the Blood Avatar as a big finisher
Once per turn: You can declare 1 Type and Attribute