For example, if an attacking creature would deal 8 damage to you and you control two Ancient Adamantoises, you'll choose which of those Ancient Adamantoises will take that damage
Having the discard not be a cost is usually an upside as you don't lose the cards if they counter it, but in a deck like dredge this will at times be a drawback as you actually want to put cards in your graveyard
I tossed around some ideas and came up with this decklist, and played around with it a bit, but couldnt seem to get it to really work
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This means you can get the ability going as soon as Choco drops, and can hold it back to keep your card advantage engine safe
In all honesty, I have some sympathy for that argument