preconstructed theme decks are: "Aura Mastery" (White/Blue), "Mortal Coil" (Blue/Black), "Army of Entropy" (Black/Red), "Overkill" (Red/Green), and "Turnabout" (White/Green). Mechanics Shadowmoor introduced the mechanics conspire, persist, untap and wither. Conspire - When you play a spell with conspire, you may tap two creatures that share a color with it to copy the spell, choosing new targets if desired. Persist - When a creature with persist is put into a graveyard from play, if it had no −1/−1 counters on it, it returns to play under its owner's control with a −1/−1 counter on it. Untap - The untap keyword action now has a symbolic representation which only appears in costs of activated abilities. Wither - A creature with wither deals damage to creatures in the form of −1/−1 counters. Shadowmoor also introduced the monocolor hybrid mana symbol, a hybrid symbols displaying a number and a color mana symbol can be paid for with either the number of colorless mana depicted or the colored mana. The converted mana cost of these cards is the highest possible cost that they can be paid for with. Examples of this are shown in a cycle including cards such as and . also has a monocolor hybrid mana in its manacost, but it has one monocolor hybrid mana symbol for each color, making it the only multicolored card with all of the monocolor hybrid symbols. Eventide Set Details Five theme decks were released as part of Eventide. The preconstructed theme decks are: "Life Drain" (White/Black), "Sidestep" (Blue/Red), "Death March" (Black/Green), "Battle Blitz" (Red/White), and "Superabundance" (Green/Blue). The Eventide booster packs also include a rules card/token card in addition to the normal 15 game cards. Mechanics Eventide continues the block theme of hybrid cards and color matters that Shadowmoor started, as well as further use of the Wither and Persist key words. Where Shadowmoor focused on allied color hybrids, Eventide focuses on enemy color hybrid cards. Eventide also introduces two new mechanics: Chroma: this ability word makes the number of mana symbols of a particular color a variable which determines the effect of a card. One card from Eventide, , had already appeared in Future Sight, but without using the ability word Chroma. Retrace: this ability allows one to play a card out of one's graveyard with an added cost of discarding a land. Storyline The narrative picks up where the Lorwyn block storyline left off.