mtg goblin deck commander Krenko EDH | Tribal Deck His ability exponentially creates more and more Goblins than your opponents can deal with mtg goblin deck commander ELITE

Ruby has a theme of self-damage in Rise of the Floodborn and this Donald gives you a nice payoff for damaging him

This Duskmourn: House of Horror Endless Punishment Commander Deck includes 1 deck of 100 Magic cards (98 nonfoil cards and 2 Traditional Foil Borderless Legendary cards), 10 Archenemy cards, a 2-card Collector Booster Sample Pack (contains 1 Traditional Foil or nonfoil alt-border card of rarity Rare or higher and 1 Traditional Foil Uncommon card), 10 double-sided tokens, 1 deck box (can hold 100 sleeved cards), 1 Life Wheel, 1 strategy insert, and 1 reference card

You'll want to add her to a deck with other princesses since her abilities both enable and benefit from the abilities of other princess cards.

While I personally preferred pairing up The First DoctorThe First Doctor and Amy PondAmy Pond (and TARDISTARDIS and Rory WilliamsRory Williams while we were at it) to play in that space, it's understandable that folks saw the obvious pairing that headed up the Suspend deck and went for it