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Now, the issue with Novablast Wurm is that it kills your own stuff too, but given its powerful board presence, that's an acceptable consequence of the card

Commander Qty: 2 Price: $4.08 Ikra Shidiqi, the Usurper Menace Whenever a creature you control deals combat damage to a player, you gain life equal to that creature's toughness

She's a great Red only Sarkhan Vol option

into a strong contender

Focusing can also tweak a deck for mechanics, most often building around a mechanical theme or adding mechanics that the deck lacks (evasion most often)

Itll be interesting to see how these changes end up affecting various metagames on Arena in the near future