> For the complete documentation index, see [llms.txt](https://docs.splinterlands.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.splinterlands.com/gameplay/building-a-collection.md). # Building a Collection ## Building a Collection Players must build their collection of cards from the various sets of cards within Splinterlands to create teams under different rulesets and battle conditions. Keep the distinction between [Ranked Play Modes](https://docs.splinterlands.com/gameplay/modern-and-wild-ranked-battles) in mind while building your collection. Though many Wild/Survival cards are powerful and enticing, they may not be used with the Modern format. Review [Sets & Editions](https://docs.splinterlands.com/cards/sets-editions) for a comprehensive look at the various cards Splinterlands has to offer. ### **Buying Booster Packs** Players can purchase Booster Packs from the Conclave Arcana set using [Credits](https://docs.splinterlands.com/splinterlands-credits) or [Dark Energy Crystals](https://docs.splinterlands.com/dark-energy-crystals). There are 4 different packs:

To purchase packs, click [Splinterlands Shop](https://splinterlands.com/shop/packs) and click Conclave Arcana in the drop-down menu. You can click [Splinterlands Shop](https://splinterlands.com/shop/packs) and then Card Packs from the main navigation or on the landing page as well. You can find more details from those different packs here: [Purchasing Booster Packs | Splinterlands](https://docs.splinterlands.com/cards/booster-packs/purchasing-booster-packs)
[**Buying Old Sets Booster Packs** ](https://docs.splinterlands.com/cards/sets-editions)- Players can purchase old booster packs from the [Splinterlands](https://splinterlands.com/market/other-items) peer-to-peer market. [**Buying Cards**](https://docs.splinterlands.com/cards/markets/buying-cards) - Players can purchase individual cards from the [Splinterlands](https://splinterlands.com/market/card-sales) peer-to-peer market with Dark Energy Crystals or Credits. [**Renting Cards**](https://docs.splinterlands.com/cards/rentals-and-delegations/the-card-rental-system) **-** Because HIVE blockchain assets can be *delegated, meaning loaned,* to other accounts, cards can be rented using the rental marketplace at [Splinterlands](https://splinterlands.com/market/card-rentals) or third-party markets. Rented cards cannot be combined, sold, or transferred, but the renter can play them and they count toward that player's [Collection Power](https://docs.splinterlands.com/gameplay/collection-power) for tournaments. Renting cards is an excellent way for players to increase the diversity of their playable deck. ### Archons are Key To compete with leveled-up [*Units*](https://docs.splinterlands.com/gameplay/types-of-cards/monsters), remember that leveled-up [*Archons*](https://docs.splinterlands.com/gameplay/types-of-cards/summoners) are also needed. If you have leveled up card Units beyond your summoning capability, they will always be limited in a battle to the maximum level your archons allow. That's why it's a good idea to level up your Archons first, then level up the Unit cards to meet their summoning level.