Emblems can't be interacted with, so they need to be behind a pretty big gate
Urza, Lord High Artificer Urza Lord High Artificer provides mana by tapping artifacts, which fuels the second ability to cast spells from the top of your library
Most decks have at least a handful of incidental recursive effects, so just make sure you're not shutting off your own cards by playing this
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In general, we will look to rebalance rather than ban in Alchemy wherever we can
At the very least, many common cards can be used as ink , but they can also be used to shift stronger cards and support them