Spider Spawning [Innistrad] Ape Warrior Set: Urza's Saga Type: Creature

Set: Urza's Saga Type: Creature — Cat Rarity: Common Cost: {2}{G} Whenever Cave Tiger becomes blocked by a creature

Set: Amonkhet Prerelease Promos Type: Enchantment Rarity: Rare Cost: {2}{U} Whenever you cycle or discard a card

The protocol is obvious

Set: Scars of Mirrodin Type: Creature — Phyrexian Horror Rarity: Uncommon Cost: {4}{B}{B} {B}

When Worldspine Wurm is put into a graveyard from anywhere

Spider Spawning [Innistrad] Ape Warrior Set: Urza's Saga Type: CreatureSet: Innistrad Type: Sorcery Rarity: Uncommon Cost: {4}{G} Create a 1 2 green Spider creature token with reach for each creature card in your graveyard. Flashback {6}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)