Momentum

Enchantment - Aura, 2G (3)
Enchant creature

At the beginning of your upkeep, you may put a growth counter on Momentum.

Enchanted creature gets +1/+1 for each growth counter on Momentum.¹
Illus. Carl Critchlow

Gatherer Card Rulings [Nov 2009]

• 10/4/2004: Putting on a counter is optional. If you forget, you can't go back later even if it is something you usually do.

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard, MTGO Classic
Printings (1/6)	Urza's Destiny (Uncommon)