Livaan, Cultist of Tiamat

Spellslinger and pump-target usually pull a deck in opposite directions: one wants a low creature count and a stack of instants, the other wants a threat that connects. This resolves the tension by paying you for the deck you already meant to build. Every noncreature spell you cast hurls its mana value at one creature as raw power, so a two-mana cantrip is a +2/+0 nudge and a splashy seven-drop sorcery is a lethal swing. The 1/3 body is deliberately unambitious: it wants to sit back and dodge a stray removal spell, because the payoff scales with the spells stacked behind it, not with the commander's own combat math. The Background slot is what makes the archetype cohere, letting the second commander supply the card advantage, sacrifice value, or extra red mana that a spell-density build tends to run dry on; you assemble the engine and the finisher across two command-zone cards instead of forcing both into one. The pump is only +X/+0, never toughness, which fixes its role as a Voltron kill button rather than a defensive prop: this is a card for connecting once, hard, on the turn you empty your hand onto a single evasive attacker. A wide board does almost nothing for it; one flier and a fistful of instants held for the crackback is the whole plan, since every spell you cast mid-combat keeps growing the swing.