Understanding card synergies and counters is crucial. For example, a Giant pairs well with a Musketeer behind it for ranged damage. A Valkyrie effectively counters ground swarms. An Inferno Tower counters high-health tanks. Always consider what your cards are strong against and what they are weak against. Building a deck with good synergy means your cards support each other, while knowing counters allows you to anticipate and defend against opponent's plays effectively.
