Mary Jane Watson

The rate-limiter is doing the heavy lifting here. A tribal payoff that draws whenever your Spiders enter the battlefield is normally a run-away engine: chain enough triggers in a turn and the card advantage snowballs past the point of interaction. Capping the draw to once each turn turns that engine into a steady drip, which is exactly the discipline a two-mana body needs to be printable. You are not being rewarded for going wide with Spiders on a single turn; you are being rewarded for adding a new Spider to the board every turn, one at a time, which frames the card as a value anchor rather than a combo piece. The Selesnya identity reinforces the shape: green fills the board and white protects it, and the once-per-turn clause asks you to keep a stream of bodies coming rather than dump your hand in a single burst. There is a design honesty to putting a card-draw ability on a fragile 2/2 with a legend clause: it invites removal, and every point of pressure your opponent spends to deny your draws is pressure they cannot spend elsewhere. The flavor and the function line up cleanly, tying a Spider-summoning draw engine to the character most synonymous with that particular web of relationships. It is a tribal lord's replacement for the anthem, trading stat-pumping for information and asking the deck to earn its cards a summon at a time.