The classic memory pairs game, head to head. The matching cards aren't identical, they're synonyms (like brave and courageous). Take turns to flip two cards: find a match and you keep the pair AND go again. Miss, and it's the other team's turn. Most pairs when the board is empty wins.
Built for an interactive whiteboard or a shared tablet, taking turns. The go-again rule means sharp memory snowballs, so encourage both teams to watch EVERY flip, even the other team's. Matched pairs stay on the board in the winning team's colour, and the recap at the end is worth reading aloud together.