They all net you more cards, but certain methods are better for collectors and certain ones work better for those hoping to build a meta deck
The number of symbols indicates how many energy cards you need to discard to retreat this Pokemon
Irida #204 (Pokemon Astral Radiance | Pokemon Cards) prices are based on the historic sales
Marcy: Brynhildr is an Eidolon (another word often used for Summon, all of which are essentially a term for a category referred to as "Avatars") in FFXIII, where she appears as a motorcycle ridden by Sazh, and transforms into the form seen here when summoned
If your opponent runs out of cards in their deck, and therefore cant draw a card at the beginning of their turn, you win
Aggregated market prices are a fair midpoint Marketplace market prices smooth out one strange sale and give you a defensible middle figure to negotiate from