Necrotic Ooze + Boa Constrictor + Devoted Druid

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