They help manage tempo and keep you alive when the whole table starts looking at you as a threat
If you don't put the card onto the battlefield, put it into your hand
Should they complete the task, they will turn to crystal, and if they fail they will become Cie'th, or monstrous fiends

FINAL FANTASY XIV-THEMED DECKBattle your friends with FINAL FANTASY XIVs iconic heroes, villains, and spells with the strategic gameplay of the Magic: The Gathering collectible card game ALWAYS SEEK OUT NEW KNOWLEDGEBe a master caster and gain control with card advantage as you band together with Yshtola, Nights Blessed to aid Eorzea in its time of need 25 NEW CARDS plus ALL NEW ARTAll 100 cards in this ready-to-play deck feature new FINAL FANTASY-themed art, including 25 Commander cards entirely new to Magic: The Gathering 2 FOIL LEGENDARY CARDSEach deck includes 2 Legendary Creature cards with a shiny Traditional Foil treatment that can be played as your commander COLLECT SPECIAL ALT-BORDER CARDSEach deck also comes with a 2-card Collector Booster Sample Pack containing 2 alternate-border cards of rarity Rare or higher The Best Final Fantasy Deck For Value Limit Break absolutely nailed the value category, with four big-money reprints and a ton of other valuable staples scattered throughout

Finding eight cards that are better in the sideboard isnt as easy as it largely depends on your playstyle
If you do, draw X cards, then mill X cards, where X is that creatures power