A good mana curve: You should have a high number of cheap spells (1 and 2 mana cost), a good number of mid-range spells (3 and 4 mana cost), and only a few expensive, game-winning spells (5+ mana cost)
Even better, it auto-equips those rebels at the start of combat, making your new army instantly battle-ready
Plus, all those merfolk in Lorwyn Eclipsed need an opportunity to shine
This crafting scheme requires you to earn, or sometimes buy, additional Wildcards of the right rarity to make copies of the card you need to finish off your deck
You can play the card with its typical ability, or use the Adventure half for a different effect, exiling it for use later