5C mana-fixing rocks like Chromatic Lantern, Fellwar Stone, and Coalition Relic are perfect here, but even the signet cycle (Golgari Signet) and the talisman cycle (Talisman of Creativity) do a great job here
Thats almost ideal in decks that want to draw and discard a bunch or decks that play wheel effects
March of the Machine, for instance, has tons of serialized cards, but its Collector Booster boxes are only $400
When this creature deals combat damage to a player, exile it and the top card of your library in a face-down pile, shuffle that pile, then manifest those cards
Slotting in Welcoming Vampire to replace Sporemound is a good choice, reducing the overall casting cost curve of your deck a little and replacing a card that relies on landfall triggers to be good, something the deck isnt optimized for
Parting Gust