Matter Maker
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Matter Maker • Star Alliance • Artifact • Rare • You may play upgrades as if they belonged to the active house. • Artist: David Tenorio • Card Number: MM:349, DT:269, VM2023:287, VM2024:234, MoMu:333
Official Rulings
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Yes to all three. Explo-rover’s ability allows it to be played as an upgrade anytime an upgrade could be played.Source: Rulebook
Can I play Explo-rover (WC 297) as an upgrade if my opponent sacrificed Lifeward (COTA 077) on a previous turn?
If I have Matter Maker (MM 349) in play, can I play Explo-rover (WC 297) as an upgrade when Star Alliance is not my active house?
If my opponent has Kaupe (DT 341) in play, and I've already played a creature, can I still play Explo-rover (WC 297) as an upgrade?
Yes to all three. Explo-rover’s ability allows it to be played as an upgrade anytime an upgrade could be played.
Source: Rulebook