MTG Salvation

Also, I know Felidar Guardian has been mentioned with Restoration Angel, but it also goes infinite with Wispweaver Angel and Phyrexian Metamorph too. To make any of the combos actually achieve anything, Altar of the Brood for mill, or any of a whole number of options for life-gain (eg. Healer of the Pride, Impassioned Orator, Suture Priest etc.)

Edited to remove non-Modern references. Thanks Lectrys.

Pitiless Plunderer + Drowner of Hope soulbonded with Deadeye Navigator gives infinite Eldrazi Scion tokens, and therefore infinite mana of any variety because of Pitiless Plunderer triggering off token creatures dying, so you can sac them for infinite Treasure tokens.