Kylox, Visionary Inventor

The attack trigger does something unusual with the sacrifice-for-value archetype: instead of turning your board into damage or draw, it converts total creature power into a fuel gauge for free spells. Sacrifice any number of your other creatures, add up their power, and exile that many cards off the top; every instant and sorcery among them becomes castable without paying its mana cost. A wide board becomes a burst of spellslinging on the swing, and because the exiled pool is the randomized top of your library rather than cards you hold, the size of the payoff tracks how much power you feed it, not any specific card in hand. That construction wants a deck built to lose creatures and chain spells: cheap fodder to supply the power, a spell suite that gains from being cast in sequence, and a plan for surviving the fact that you gut your own board every combat. The body earns its keep too. Haste means the trigger fires the turn it resolves, menace complicates the gang-block that would otherwise stop the attack, and ward taxes the cheap removal that would punish a seven-mana investment mid-swing. The variance is what keeps it honest: you set the sacrifice count, but not what gets exiled, so power dumped into a run of lands or creatures is power wasted. The card rewards a library dense enough with instants and sorceries that exiling for power reliably finds something to cast.