Clash of Armour

Clash of Armour runs on a card-battler's economy rather than a traditional RTS one: tank units come as cards drawn from a deck, and the credits needed to deploy them regenerate on a timer, so the real decision every match is which card is worth playing right now versus saved for a better opening.

Fast, cheap units are best spent probing what the opponent has in hand and forcing an early reaction, while saving credits for a heavy long-range card pays off once you've seen enough of their deployments to commit safely. Overspending on offense while your own turret sits undefended is the most common way a lead turns into a loss, since a counterpush against an empty defense can undo several turns of progress in one move. Clash of Tanks is the direct sibling to try next if this card-and-credit system is what you're after.