Stealthster
From Archon Arcana - The KeyForge Wiki
Stealthster • Star Alliance • Creature • Uncommon • Elusive. (The first time this creature is attacked each turn, no damage is dealt.)Stealthster may be played as an upgrade instead of a creature, with the text: “This creature gains elusive.” • Artist: Roman Semenenko • Card Number: MM:329, WoE:320, MoMu:350
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