Bloom Tender, and Umbral Mantle

Prerequisites

• Bloom Tender on the battlefield
• Umbral Mantle on the battlefield
• Umbral Mantle attached to Bloom Tender
• Bloom Tender does not have summoning sickness
• There are at least four colors among permanents you control

Steps

1. Activate Bloom Tender by tapping it, adding at least
2. Activate Bloom Tender by paying and untapping it, giving itself +2/+2 until end of turn
3. Repeat

Results

• Infinitely large Bloom Tender until end of turn
• Infinite mana of colors among permanents you control