Song of Spring
From Archon Arcana - The KeyForge Wiki
Song of Spring • Untamed • Action • Common • Play: Shuffle any number of friendly Untamed creatures from your hand, discard pile, or battleline back into your deck. • Artist: Regis Torres • Card Number: AoA:332, ToC:313
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Commentary
When you play Song of Spring you may choose any number of creatures from your hand, any number of creatures from your discard pile, and any number of creatures from play to shuffle back into your deck.
When resolving the ability of Song of Spring, "any number" can be treated as zero.
Source: "Any Number"