Once and Future

Adamant is a threshold that pays you for committing to a color, and this is the cleanest illustration of the mechanic's logic: the same spell buys two different graveyard operations depending on how much green mana you funneled into it. Cast it with green stretched thin, and it splits the recursion (one card straight back to hand, the other set on top of your library, meaning you draw it next turn instead of holding it now), which is a genuine restriction rather than a downside dressed up as one: the tuck half converts immediate card advantage into a timing tax, forcing you to spend a draw step on a card you already chose. Spend at least three green mana and the spell collapses that split into pure card advantage, returning both targets straight to hand. What keeps the payoff honest is the self-exile clause: this is a one-shot, not an engine, so the return is unconditional but never repeatable. That single exile line separates it from the graveyard-recursion loops that give this kind of effect its bad reputation. The two-mode structure rewards deck construction the way the best color-committed designs do, penalizing greedy manabases and handing heavily green builds a strictly better version of the same effect. It is a modest card doing a precise job: instant-speed graveyard retrieval whose ceiling and floor are both fixed by a manabase choice you made turns earlier, not by whatever you happen to draw next.