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These are traded at very high prices

Another exploit is to repeatedly start new games on the second memory card and trade all the Starter Deck cards back to the first memory card, effectively giving it 40 cards at no cost

As is, for the most part, I think they're largely going to get sidelined, barring a few possibilities like Basilica Shepherd as an alternative to Soul of Migration for flicker strategies

Seeing these as lands would not be surprising, and maybe theyll look a little like this

This gives your opponent the option to draw an extra card for each mulligan you take, an advantage theyll almost always accept