CALV-1N
From Archon Arcana - The KeyForge Wiki
CALV-1N • Star Alliance • Creature • Uncommon • Fight/Reap: Draw a card.CALV-1N may be played as an upgrade instead of a creature, with the text: “This creature gains, ‘Fight/Reap: Draw a card.’” • Artist: Jason Juta • Card Number: WC:308
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Fight/Reap: Draw a card.
CALV-1N may be played as an upgrade instead of a creature, with the text: “This creature gains, ‘Fight/Reap: Draw a card.’”
WC 308
Artist: Jason Juta
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
Commentary
Quixxle Stone creates a play restriction that does not allow creatures to be played. According to the Shadow of Dis FAQ, card abilities can modify how the card itself enters play (Silvertooth's ability, for example, modifies how it enters play). Therefore, a creature with an ability that is a replacement effect that allows it to enter play as a different card type (such as Explo-rover or CALV-1N, which can be played as upgrades) can be played as that card type, even while Quixxle Stone is in play.