Combos Utilizing Fecundity

by discarding a card you gain a 1/1 creature, two mana, and you can draw a card.

Make a saproling with saproling cluster then sac it to the altar for 2 mana and draw a card with fecundity then discard that card to saproling cluster, repeat for an extra mana each time

remove 6 fade counters from burst putting 6 saproling creatures into play. bounce burst back to your hand with temporal adept. burst leaves play & 6 saprolings die. draw 6 cards cuz of fecundity.

this will give you an infinite colourless mana combo - sac ornithopter to ashnods and put it onto your library then draw the ornithopter.

sacrifice cathodion for 5 colorless mana using ashnod's altar. then put it on top of your library using haunting crossroads and bog initiate. then let priority take over for fecundity to draw it.

cluster creates 1/2 saproling token. sac token to altar for 1 mana of any color. fecundity permits you to draw card when creature goes into your graveyard

Gain control of their creatures, sac em to deal 1 damage each, then draw the cards. Afterwards pummel em with your own creatures.

Sacrifice Sword of the Meek. Use the mana to remove and replace a counter from Thopter Squadron. Draw as many cards as you want for free. If Seismic Assault is in your deck, cast it, and win by discarding lands.

pay 1, discard a card from your hand and get a saproling with cluster. Sack the saproling with asnod's altar and get 2 colorless, then use fecundity to draw a card. repeat, then use fireball

Sacrifice bears for infinite mana. A second Fecundity gives infinite drawing, and bears.