Ashnod's Altar + Ghave, Guru of Spores + Juniper Order Ranger Result: Infinite sac triggers. Infinite ETB triggers. Infinite LTB triggers. Infinite +1/+1 counters. Infinite colorless mana. Infinite tokens. Requires: All permanents on field. 2 mana available. Steps: Use one mana to remove a +1/+1 from Ghave and make a 1/1 saproling. The saproling enters with a +1/+1 on it from the ranger. Spend your second mana to remove the +1/+1 from the saproling and make another saproling. Sac the first saproling to Ashnod's Altar to float two colorless mana. Use one of the colorless mana to activate Ghave again and remove the +1/+1 from the second saproling, making a third. Repeat steps 3 and 4 for infinite ETB, Sac, and Colorless mana. If you want infinite saprolings instead of mana, then spend the mana generated to continue the engine and only use the altar on every other saproling. If you want infinite +1/+1's then do step 6, sac one saproling to Ashnod's Altar, use the floated mana to activate Ghave's other ability. Rinse and repeat.

Ashnod's Altar + Cathars' Crusade + Corpse Knight + Ghave, Guru of Spores Result: Infinite sac triggers. Infinite ETB triggers. Infinite LTB triggers. Infinite +1/+1 counters. Infinite colorless mana. Infinite tokens. Infinite damage. Requires: All permanents on field. 2 manaavailable. Steps: Use one mana to remove a +1/+1 from Ghave and make a 1/1 saproling. The saproling enters with a +1/+1 on it from the crusade. Corpse Knight then deal 1 damage. Spend your second mana to remove the +1/+1 from the saproling and make another saproling. Sac the first saproling to Ashnod's Altar to float two colorless mana. Use one of the colorless mana to activate Ghave again and remove the +1/+1 from the second saproling, making a third. Repeat steps 3 and 4 for infinite ETB, Sac, and Colorless mana. If you want infinite saprolings instead of mana, then spend the mana generated to continue the engine and only use the altar on every other saproling. If you want infinite +1/+1's then do step 6, sac one saproling to Ashnod's Altar, use the floated mana to activate Ghave's other ability. Rinse and repeat.

Anointed Procession + Ashnod's Altar + Ghave, Guru of Spores
Result: Infinite colorless mana. Infinite LTB triggers. Infinite ETB triggers. Infinite death triggers. Infinite +1/+1 counters. Requires: All permanents on field and available Steps: Pay 1mana and 1 mana and remove a +1/+1 counter from Ghave to activate it's ability and create two saprolings. Sacrifice one saproling to Ashnod's Altar, generating ​2 colorless mana. Pay 1mana and sacrifice the other saproling to activate Ghave's ability to place a +1/+1 counter on it. Repeat