Earthcraft, Darksteel Garrison, and Lifespark Spellbomb

Prerequisites

• Earthcraft on the battlefield
• Darksteel Garrison on the battlefield
• Lifespark Spellbomb on the battlefield
• Darksteel Garrison attached to an untapped basic land
• available

Steps

1. Pay and sacrifice Lifespark Spellbomb, targeting the fortified land
2. Tap the fortified land with Earthcraft, untapping itself
3. Darksteel Garrison triggers giving any creature +1/+1 until end of turn
4. Repeat

Results

• Infinitely large creatures