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However, if GB Delirium and Aetherworks decks are the top decks in the format, then Yahenni's Expertise could be relegated to sideboards as a trump card for aggressive matchups, at least until rotation in the fall

It was the echo experiment that got them to the idea that you could steal a creature of any mana value but only got to keep it if you were able to pay the energy cost

It is said to be the guardian of the seas

All that mana does no good if your well-known threat of a commander gets countered, so a Cavern of Souls is excellent protection

Not only does this tie up their mana each turn, but when they can't pay it anymore, they lose 20 life