Deck optimization

The term deck optimization (or deck tuning) refers to iteratively improving a play deck in a collectible card game. This is usually done through test or trial play sessions, during which the deck's performance is evaluated. After observation and consideration, changes are made to the deck, and its new performance can then be judged. This cycle can be repeated as needed.

When adjusting the cards in a deck, the following items should be considered:

While players can completely re-design a play deck, most optimizations involve relatively minor changes to the deck. This typically involves selecting a card (of which multiple copies may be present) and replacing it with another card which is similar, but slightly better for one or more reasons. The reasons may include: lower cost, better synergy with existing cards, more flexible alternate uses, or increased effectiveness against known opponent strategies.

In addition to manually poring over card text, the Internet has also become a popular source for those seeking deck optimization information. Players can either directly consult existing deck lists for inspiration, or can ask on online forums for advice or recommendations.

In some cases, effective optimization requires the purchase of additional cards, since the cards a player might like to use may not currently be in his or her possession. This can drive up the cost of the overall gaming experience, and can in some cases initiate an arms race in local circles, where other players must in turn purchase cards to continue to compete.

...
Wikipedia