"[Type]cycling [cost]" means "[Cost], Discard this card: Search your library for a [type] card, reveal it, put it into your hand, then shuffle." This type is usually a subtype (as in "Mountaincycling") but can be any card type, subtype, supertype, or combination thereof (as in "basic landcycling")
When everything goes right, playing this deck can be a tonne of fun but its unreliable at best and the worst performing of the Set 1 Starter Decks
Common 199 Ket the Storm Rage On Common 200 Pick a Fight Uncommon 201 Strength of a Raging Fire Rare 202 Last Cannon Common 203 Mouse Armor Uncommon 204 Weight Set Rare Disney 100 Collectors Edition Promo Cards Checklist 6 cards
The one downside is this card can be removed easily
Then exile it.) The value of X is calculated only once, as The Final Days resolves
But the lead up has done something you do not always see before a new TCG set drops