First printed in Scourge (2003)
Accelerated Mutation 
Instant
Target creature gets +X/+X until end of turn, where X is the greatest mana value among permanents you control.
Legality
Constructed
- Standard Not legal
- Pioneer Not legal
- Modern Not legal
- Legacy Legal
- Vintage Legal
- Pauper Legal
- Future Standard Not legal
- Historic Not legal
- Timeless Not legal
- Alchemy Not legal
- Penny Dreadful Legal
- Premodern Legal
- Old School 93/94 Not legal
Singleton
- Gladiator Not legal
Commander formats
- Commander Legal
- Duel Commander Legal
- Pauper Commander Legal
- PreDH Legal
- Tiny Leaders Not legal
- Oathbreaker Legal
- Brawl Not legal
- Standard Brawl Not legal
- Competitive Brawl Not legal