The Level 1 of this wouldnt be worth it on its own, as using up a whole card for a fairly mediocre morbid effect that will only trigger every couple of turns or so just isnt what you want to be doing
So you can easily harvest 14 or 15 mana of cards from your 7 mana investment even in a deck not built around breaking it
It is a fairly simple equation of cards per mana, you will find Ancestral Recall at the top of that list with Ancestral Visions and Treasure Cruise next in line, shockingly the best draw effects in the game
Minsc & Boo, Timeless Heroes Our penultimate planeswalker is this 3 loyalty Gruul option, and it's a lot of fun, it comes with a 1/1 Hamster with haste and trample to block attacks on it, and then you make another each of your upkeeps if it's not on the battlefield, to keep on blocking
Food Chain has created some devastating combo loops in Eternal formats and, more recently, competitive Commander decks
Among other things, this lets players spam Ancestral Recall with Emeritus of Ideation , or generate infinite mana with Blazing Firesinger