Phantom Steed + Port Razer = new token of Port Razer tapped and attacking each combat. The token is sacrificed at end of combat, but Port Razer triggers off combat damage, not being declared as an attacker. Remove Port Razer/

Dualcaster Mage + Rite of Replication = infinite. Avoid Dualcaster Rituals (Early Harvest) + Capsize (Venser) + Recur ETB Creature (Eternal Witness) = infinite. Avoid Witness

Bala Ged Recovery + Venser + Early Harvest = Infinite mana.
2GUR + 2UUUG + 1GGUR = 5GGGGUUUUURR
2 Forests, 3 Islands, 1 Mountains, 3 Basic Lands
3GGUUUR -> Early Harvest ritual -1GGUR + 6GGGGUUUUUURR
8GGGGUUUUUUUURR -> Bala Ged copy recur -2GUR
6GGGUUUUUUUR -> Venser buyback -2UUUG
4GGUUUUR -> Profit 1U
Leave it in or remove it? 4 specific card combo. 9 basic lands. Same thing works with Brass's Bounty but requires 11 lands.
11 -> Brass -9 +22
24 -> Bala Venser -5 -6
13 -> Profit 2
Remove Venser?