3 Pashalik Mons Pashalik Mons is an affordable enough card at just 3 mana (2 colorless and 1 red) and can really help any goblin deck
The nice thing about making a tailgate worth of Biovisionaries is that its not too far off your gameplan in quite a few Simic decks, so youre not contorting your strategy around a convoluted combo
Snapcaster MageSnapcaster Mage (40,677 Inclusions, 2% of 1,944,838 Decks) While we made the choice early on to build around the graveyard third of Doc AurlockDoc Aurlock, rather than the exile and Plot portions, there's no way we won't be including some of them
Note Valkyrie Harbinger is similar, but is twice as expensive to cast
Ive had Spell Pierce in the past when Fatal Push didnt make every spell almost free, and Thoughtseize might be fine