mtg arena only cards Keruga, the Macrosage | Ikoria: Lair of Behemoths | Modern Magic Arena Exclusive Cards (Legal

UL03_XR Land B ocT: Add B to your mana pool and CARDNAME deals 1 damage to you

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Alternatively, you can use bounce lands which auto-return to hand, and either make infinite kitties or grow your team arbitrarily big with Felidar Retreat, or just straight up murder everyone by exiling your library with Valakut Exploration

If you would rather not restrict your deckbuilding, Jegantha is also a solid card in the 99 of any 5 color deck playing a lot of 3+ color spells

Sometimes that will make sense and be great

Rakdos Cackler is a good start since that gives you a 3/3 and then 4/4, limiting potential answers, and Tormented Hero is another reasonable target