Urza copies Bag End Banquet for . The copy makes three Foods and taps for for each Food you control, so each copy makes three more mana than the one before.
Mana to start
Each loop costs
Loops before it pays for itself
2
Your mana, step by step
100050100150200
To start: To start: 0
Pay : 3 leftPay : 3 left1
The copy taps for 3: 6The copy taps for 3: 62
Pay : 0 leftPay : 0 left3
The copy taps for 6: 6The copy taps for 6: 64
Pay : 0 leftPay : 0 left5
The copy taps for 9: 9The copy taps for 9: 96
Pay : 3 leftPay : 3 left7
The copy taps for 12: 15The copy taps for 12: 158
Pay : 9 leftPay : 9 left9
The copy taps for 15: 24The copy taps for 15: 2410
Pay : 18 leftPay : 18 left11
The copy taps for 18: 36The copy taps for 18: 3612
Pay : 30 leftPay : 30 left13
The copy taps for 21: 51The copy taps for 21: 5114
Pay : 45 leftPay : 45 left15
The copy taps for 24: 69The copy taps for 24: 6916
Pay : 63 leftPay : 63 left17
The copy taps for 27: 90The copy taps for 27: 9018
Pay : 84 leftPay : 84 left19
The copy taps for 30: 114The copy taps for 30: 11420
Pay : 108 leftPay : 108 left21
The copy taps for 33: 141The copy taps for 33: 14122
Pay : 135 leftPay : 135 left23
The copy taps for 36: 171The copy taps for 36: 17124