Murasa Behemoth

Green's fatties usually charge their whole cost in mana; this one shifts part of the bill into the graveyard instead. Six mana buys a 5/5 trample floor, but the printed rate assumes the buff is off, and it rarely is: a cracked fetch, a milled land, or a discarded excess land trips the condition for free. Meet it and the body swings to 8/8, a size that badly outstrips the mana line the moment your yard cooperates. The subtlety is that the boost is a continuous static check rather than an enters-the-battlefield trigger, so it can be turned off mid-combat: strip the last land from your graveyard with exile-based hate and the creature shrinks back to 5/5 in the middle of a swing, which quietly makes an otherwise unremarkable Beast a live target for effects that would ignore a lone green threat. That fragility is what pays for the discount. Because green decks routinely churn through their own lands anyway, the requirement reads less like a hoop and more like a formality, and the payoff lands cleanest in lists already built to fill a graveyard rather than protect one.