Woodland Weavemaster, and Seedcradle Witch

Prerequisites

• Woodland Weavemaster on the battlefield
• Seedcradle Witch on the battlefield
• at most available

Steps

1. Activate Woodland Weavemaster by tapping it, adding an amount of equal to its power that can only be spent to activate abilities of Elves or to cast Elf spells
2. Activate Seedcradle Witch by paying , untapping Woodland Weavemaster and giving it +3/+3 until end of turn
3. Repeat, alternating between adding and each loop as needed

Results

• Infinite colored mana that can only be spent to activate abilities of certain creatures
• Infinite colored mana that can only be spent to cast spells of a certain creature type
• Infinitely large creatures you control until end of turn