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Birds of Paradise and Sliver Legion are both high-value cards, so having two of them in one drop gives you more than enough to get a lot of value out of it

Then the defending player guesses whether the mana value of that card is greater than the number of artifacts you control

Custom sizing for specific slab dimensions (e.g., PSA, BGS) is in high demand

You can counteract this with Young Pyromancer to make more tokens, with Queen Brahne and Kuja, Genome Sorcerer able to make tokens as well, albeit much slower

You need more powerful cards and unique ways of catching up to these decks if you have any hope of turning the corner against them