They get to destroy the artifact or creature of their choice and any cards of yours that happen to match it, unless they have a reason to take a shot at your hand
Delve says that, for each generic mana in a spells cost, you may exile a card from your graveyard rather than pay mana
The best way to get the flashiest cards, Collector Boosters are souped-up with rares, foils, and special treatments you wont find anywhere else, including the possibility of a special Serialized card, grand prize of the multiversal death race
Card databases have access to all the cards in MTGs history and will typically let you filter by name, card type (and subtype), rarity, color, mana cost, set, format legality, and so on
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