Lost Knowledge of the Arcane

(At the beginning of your upkeep, put a research
counter on this. Counters unlock cumulative effects.)
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(1): Your instant and sorcery spells cost 1 less.
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(4): Your instant and sorcery spells cost 1 less.
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(7+): You may cast instant and sorcery spells
from your graveyard. When you cast a spell
this way, exile