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Against the blue decks you generally want to save it for their end step, against the aggro decks you want to combat step it, while against the midrange decks its often best used in the upkeep just to tap down lands (Tron literally cant interact at anything other than Sorcery speed)
Thief's KnifeThief's Knife Many blue enchantments will allow all your creatures to draw a card when they hit
Also, they need to not bench an army of Genesect V early, so they are safe from damage
2023-11-10 If a token is exiled this way, it ceases to exist and won't return to the battlefield
Its good for green decks that are low to the ground, even in a format with Llanowar Elves