Giant Trap Door Spider

Defensive removal stapled to a body, built entirely around the geometry of combat. The activation only fires on a creature attacking you, and only one without flying, so this is a wall that eats ground assaults rather than a roaming answer. The pricing is steep and deliberate: a second on top of the casting cost, plus the tap, which means committing nearly the card's full cost again to do its job. And it exiles itself in the act, so the whole exchange is a one-for-one trade dressed up as a creature: you pay a 2/3 plus six mana across two turns to remove a single attacker, with the spider gone afterward. That self-exile clause is the balancing valve. Without it the card would be a repeatable removal engine on a sticky body; with it, the spider is a single-shot ambush that asks you to pick your moment, since you only ever get to spring the trap once. The flavor lands cleanly too: the trap door spider lunging up from the ground to drag a creature down into the earth with it, both of them gone. It reflects how red and green once handled interaction: blocky bodies with expensive, conditional removal grafted on, a generation before either color had access to the clean efficiency it carries now.