Most cards on this list let you double +1/+1 counters, like Kalonian Hydra, since theyre the most common kind, while others let you double any type of counter
However, due to past precedent in previous Secret Lair drops, the most likely card to be an easier sell would probably have to be Smugglers Copter
Max Mushrooms Roto Boost Swap Snack Twice-Spiced Radish X Accuracy X Attack X Defend X Sp
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What was the first card or set of cards they asked you to try to make
When The Ur-Dragon does eventually hit the board, it turns the rest of your Dragons into powerful draw engines and threatens to put some of Magic: the Gathering's most devastating threats on the table