Color Identity: B, G

Prerequisites

  1.  
    Necrotic Ooze
    Necrotic Ooze     on the battlefield.
  2.  
    Boa Constrictor
    Boa Constrictor     and
    Devoted Druid
    Devoted Druid     in your graveyard.
  3. Necrotic Ooze
    Necrotic Ooze     does not have summoning sickness.
  4. It is your precombat main phase.

Steps

  1. Activate
    Necrotic Ooze
    Necrotic Ooze     using
    Boa Constrictor
    Boa Constrictor    's ability by tapping it, giving it +3/+3 until end of turn.
  2. Activate
    Necrotic Ooze
    Necrotic Ooze     using
    Devoted Druid
    Devoted Druid    's second ability by putting a -1/-1 counter on it, untapping it.
  3. Repeat.
  4. Once
    Necrotic Ooze
    Necrotic Ooze     has infinite toughness, you may instead use
    Devoted Druid
    Devoted Druid    's first ability to get infinite green mana.

Results

  1. Infinite green mana.
  2. Infinitely large
    Necrotic Ooze
    Necrotic Ooze     until end of turn.

Metadata

  1. In 3 decks according to EDHREC.
footer