In general, I got the impression that the Hero deck, in a streamlined design, won about 40 percent of its games against the Rats
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Regeneration gives it resilence and makes it more beneficial for you to put it through the combat phase
Card Name Mana Cost Type Artifact - Spacecraft Rarity Rare rules Text When this Spacecraft enters, it deals damage equal to the number of artifacts you control to target creature an opponent controls.Station (Tap another creature you control: Put charge counters equal to its power on this Spacecraft
I mean for normal players
Still, if you don't already have the rare duals, replacing them with Contaminated Aquifer and Dismal Backwater is a fine plan for the short term, although in the long term, you'll probably need to upgrade to compete at the higher ranks