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Thief of Existence won't gain another ability

Theres one last desperate look in the eyes before the curtains are drawn

However, the website Pokemoncard.io has a Sample Hand function in its deck editor that can help you with basic goldfishing of your starting hands before you have one

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FromTheShire: Absolute worst case it's redundancy which is never a bad thing to have, but counters decks can easily be doing things on each turn to somewhat break the restriction and this has the upside of counting any permanents, not just creatures

Galadhrim Ambush Galadhrim Ambush is a very similar card to Arachnogenesis, and it'll probably be a green staple in EDH, particularly in elf decks