Specifically, there are a number of legendary creatures with the Doctor's Companion ability, like Rose Tyler and in that case you can have two commanders, a Doctor and a Doctor's Companion
Then when your foes discard lands, you make free 1/1 Bats with flying and Black, so that's a win con Waste Not for any lands discarded like with cycling or channel as well as to this attack trigger
But at the start of each of your turns, you'll lose life for each of those counters
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Whole Cake Island cards bolster Charlotte Katakuri (OP11-062) and the Big Mom Pirates with high-power control strategies
The ideal is getting use out of your ability-laden creatures first from Odric, Lunarch Marshal, trigger Kathril, then use Soulflayer, but where's the card draw to help you get there