Foggy Swamp Spirit Keeper

The trigger draws a line most card-advantage engines never bother with: it cares about your second draw each turn, not your first. Your normal draw for the turn feeds nothing, so a passive turn leaves the Spirit factory idle. You have to actively push past one card per turn, which turns cantrips, extra-draw enchantments, and any repeatable second-card effect into token production. The Spirits themselves are built to leak damage: they can't block or be blocked by anything that isn't a Spirit, so they accumulate into an evasive board rather than a defensive wall, and the lifelink on the 2/4 frame bends the whole engine toward attrition. That is the pull the card lives inside. The body wants to sit back and stabilize a life total, but the tokens it makes want to go wide and slip through, so building around the draw trigger yields a board that gains life on defense and chips it away on offense at once. It is a value engine gated behind a deckbuilding condition rather than a passive one, and the gate is the part worth building around: hit the second draw reliably and the board snowballs; ignore your draw step and you are left with a durable three-drop with lifelink and nothing else going on.