Players use creatures, spells, enchantments, and other types of cards to lower their opponents life total and defend themselves from attack
These factors would normally make me lean toward playing eighteen lands rather than seventeen
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Then there are the "Prison" or hatebear decks, which seek to put a lock on the game with key pieces that constrict the potential of an opponent's cards, such as enchantments that prevent an opponent from attacking, make them pay extra for spells or weaken their creatures
If you control two Leylines of Hope and you would gain life, you gain that much life plus 2