Hadoken, as a functional reskin of Lightning Bolt, is legal in the formats where that card is legal: Modern, Legacy, Vintage, Commander, Oathbreaker, and Pauper
Casting Cost: Card Type: Artifact Card Text: , : You gain 2 life
Other Creatures with Enters-the-Battlefield Abilities We should also include cheaper creatures that we can cast to the battlefield earlier in the game that are worth copying with Krothuss, and there are some home-run inclusions like Solemn Simulacrum, Baleful Strike, and Mulldrifter
Draw Red has a lot of draw options, which are either "discard a card, draw a card" or "exile the top card of your library
Set: Warhammer 40,000 Sealed Release Date: 2022-10-07 Magic: The Gathering Universes Beyond: Warhammer 40,000 Collector's Edition Commander Deck Necron DynastiesThe Collector's Edition Necron Dynasties Warhammer 40,000 Commander Deck set includes 1 ready-to-play Black deck of 100 Surge Foil Magic: The Gathering cards
In terms of popularity, 2-color and 3-color tend to be the combos that get the most play