Whether it be transforming cards, werewolf cards, battles, or sagas, once Wizards of the Coast broke down the barrier of printing something different on the backside of cards, the floodgates have opened and "flip cards" galore have since been printed
Enchantment Rowan's Grim Search Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.) If this spell was bargained, look at the top four cards of your library, then put up to two of them back on top of your library in any order and the rest into your graveyard
Due to the wording of this ability, it's advised to use repeatable effects that are capable of milling small numbers of cards at a time in order to create a zombie horde, as milling a massive portion of one's deck at once will only result in a single zombie being created
all promo cards from The First Chapter set through the Azurite Sea set have a gold double wedge symbol, while promo cards since the Archazias Island set have a diamond surrounded by a layered circle
If youre lucky, you get the front side of a Kitchen Finks
The most fearsome builds of this commander Ive encountered lean heavily into artifact ramp and black board wipes like Toxic Deluge and Damnation to control the board until it overwhelms its opponents with the monsters of the deep