Expansion

From CMC Wiki

An Expansion is a set of cards all released under the same expansion symbol. An expansion symbol is the emblem on the lower right corner of each card.

Expansion Sets

The current expansions are:

Expansion:	Prime	Clash of the Webcomics	Unknown Expeditions	Principalities	War of the Webcomics	Mechanical Chaos	Masterwork Tools	Rudianos Unearthed
Logo:
Set number:	0	1	2	3	4	5	6	7

You can buy these cards in booster packs or in starter decks, save for the mini-expansions Unknown Expeditions and Masterwork Tools which are only available in booster packs.

Non-expansion Sets

Additional symbols used, but not expansions in themselves are:

Expansion:	Trophy	Donation	Voucher	Secret	Hammer of the Implementer	Event
Logo:
Set number:	994	995	996	997	998	999

These cannot be obtained through normal means. Refer to their respective article on obtaining a card with such a symbol.