Fungal Infection is a one mana removal spell in Black that gives target creature -1/-1 and makes a 1/1 green Saproling
Enter delve, a mechanic that converts your graveyard into mana
Each enchantment being only two colors instead of three also helps them find more homes in decks with some of those synergies
(It attacks each combat if able and attacks a player other than you if able.) Normally, combat damage is dealt all at the same time
Since I brew on a budget, I've usually got five or six basics in each of my colours, and I must point out that this card also spots basics anywhere on the battlefield
Its the set that gave us Nissa, Resurgent Animist, Tyvar the Bellicose, and Ob Nixilis, Captive Kingpin