Kang, Temporal Tyrant

The trick is the arithmetic of "your second card each turn." Your normal draw step is card one, so on your own turn the connive from an attack is card two, and the drain fires for free the moment you swing: no extra spell, no setup, just the combat trigger doing double duty on top of the loot and the possible counter. That is the load-bearing line, and it fires exactly once per turn no matter how many cards you see. Cracking a cantrip before combat does not add a second drain or a second clock; there is only ever one drain to be had. What extra draws buy you is timing and coverage, not volume: they let you land the second-draw trigger on a turn where you never got to attack, or slot it into a combatless plan, but they never stack it. The line to watch is the opposite one. On an opponent's turn you have no draw step, so a single triggered draw there is only your first card of the turn and the drain stays silent. If you want the life swing outside your own combat, you have to manufacture the pair yourself: two draws in the same window, deliberately. The connive earns its keep alone, filling the yard and inflating a 3/4 into a real body when you pin nonland cards under the discard. But it is the quiet second line that dictates the build: not a deck that draws a lot, but one that draws twice on purpose.