Goliath Daydreamer
Most "cast for free" payoffs pull off the top of the library or dig through the graveyard, where the cards you get are whatever the shuffle hands you. This one builds its own vault: every instant and sorcery you cast from hand skips the graveyard and lands in exile under a dream counter, so the spellbook it swings from is entirely author's-choice. You are not hoping for value on attack; you are stockpiling it, one cantrip and one burn spell at a time, then recasting them at no mana cost when the Giant turns sideways. The two clauses lean on each other: the first is a filing system that does nothing in isolation, and the second is the payoff that only works because the first has been quietly archiving everything you spent mana on. The cost of the whole plan is that pile takes turns to assemble. You spend the mana, resolve the spells, and get an attack trigger to fire (declaring the attack is enough; no combat damage required), so a 4/4 that dies to most removal is carrying a strategy that wants several uncontested turns to come online. It rewards spell-dense decks not by looping a single engine card but by letting you re-fire a curated sequence, which is a different axis from storm or flashback: the value lives in the accumulation and the timing of the swing, not in any individual card.
