The hybrid cost is the whole story before the body ever attacks. casts off either color alone, so it anchors four of TMT's five common signposts: UR, GU, BG, and RW each support it without a single off-color source. This isn't a payoff that demands a built-out pair; it's the reason any deck touching red or green wants to end on it. P1P1 when nothing else is pulling you, and a stable anchor from P1P5 onward once your base color has settled. Maindeck always.
What earns the slot is the trigger's relationship to the format's removal math. Stomped by the Foot, Bot Bashing Time, Grounded for Life: every common answer is a one-for-one, and density sits at medium, not flush. The 7/7 has haste, the trigger resolves during declare-attackers before damage, and the extra creature is already on the board when the opponent decides whether to spend a card on the body. Kill the 7/7 and they still ate a second attacker. Two cards to break even against one.
The cleanest line against it is removal before the swing, while it sits untapped. Grounded for Life can do that: it destroys an untapped creature at full cost, the tapped discount being a bonus, not a requirement. But it answers one body, not the two-for-one that fires on attack, and most of the format's removal is slower or narrower than that window allows.
The constraint is your own creature count. Because the trigger ignores mana value, a tight curve of bodies keeps it honest, while loading on Equipment like Bespoke Bō at the expense of creatures turns each swing into a long, empty dig through your library. Draft it as the apex of a board, not the centerpiece of a toolbox.

