What it does
Delve lets you exile cards from your graveyard while casting a spell, with each exiled card paying for 
of that spell's generic mana cost. So a spell costing 
could be cast for just if you exile five cards from your graveyard.
The key nuance: delve only reduces generic mana, never colored requirements—you still must pay the on Treasure Cruise's 
, er, 
(you always owe the colored pip). Also, delve isn't a cost reduction effect; you're literally paying mana costs by exiling cards, which matters for effects that care about converted mana cost—the card's mana value stays unchanged regardless of how much you delved.
In Commander, delve shines in graveyard-fueled decks, but it competes with reanimation, flashback, and escape for the same resources. Watch out: exiling your graveyard can shut off delirium, threshold, or other payoffs you're building toward.
of that spell's generic mana cost. So a spell costing could be cast for just if you exile five cards from your graveyard.
The key nuance: delve only reduces generic mana, never colored requirements—you still must pay the on Treasure Cruise's , er, (you always owe the colored pip). Also, delve isn't a cost reduction effect; you're literally paying mana costs by exiling cards, which matters for effects that care about converted mana cost—the card's mana value stays unchanged regardless of how much you delved.
In Commander, delve shines in graveyard-fueled decks, but it competes with reanimation, flashback, and escape for the same resources. Watch out: exiling your graveyard can shut off delirium, threshold, or other payoffs you're building toward.Iconic cards with Delve
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