Skullclamp, Sylvan Library, Seasons Past, and Rishkars Expertise provide some nice card advantage and selection
(Damage and effects that say "destroy" don't destroy it.) A creature attacks alone if it's the only creature declared as an attacker during the declare attackers step (including creatures controlled by your teammates, if applicable)
Golgari Ouroboroid (5 players) : Golgari Ouroboroid shares many key green cards with its Simic sibling but adds black for removal spells, Lively Dirge, and Overlord of the Balemurk, letting it find Ouroboroid more consistently
But whats a reasonable option
So, when you first play Saproling Burst, you can remove a fade counter from it to create a 6/6 saproling, then removing another counter will create a 5/5 saproling, and so on