People like weapons and armor and gadets and tools
In Magic terminology, a players deck of cards is called a library
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Naturally, Hakbal himself is a great target for this, since his attack trigger will get more value over time if he lives to tell the tale, but you can also sneak through veteran Merfolk tokens that have accrued a good number of +1/+1 counters via explore for big damage as well
In a Green Stompy deck, you only need to attack with one other creature with at least 3 power to draw a card, which, typically, close to every other creature in your deck satisfies
There's something satisfying about squeezing repeated value out of the same cards over and over again