Always loved Omanyte from Fossil and imo almost every common/uncommon from the gym sets have great artwork
It is hard to play round and great value, sometimes even tempo too
Plus, if you dont end up casting the card you exiled, then you at least get to deal 2 damage to each opponent
With trainer cards like Chili & Cilan & Cress, players can find their Pokmon that works well with Mew, like Deoxys and Latias, and build a deck that takes advantage of their power from the sidelines
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Not a whole lot for engines, but Empty the Warrens does naturally work with all of the fast mana we previously mentioned, while not using the same resource as Echo of Eons.The last deckbuilding constraint I would like to address is the symmetric nature of Echo of Eons, you can fix this with non-discard based disruption