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.
Cards put into play by another card's effect (rather than being played from an out-of-play area such as the hand or discard pile) are not considered "played" cards. If an ability “puts” a card “into play,” bonus icons and “Play:” abilities on the card put into play do not resolve.
Source: Play: (ability)
Edit this card's data.