Kenrith, the Returned King + Cryptic Trilobite + Heartstone + Mycosynth Lattice
Kenrith, the Returned King
Cryptic Trilobite
Heartstone
Mycosynth Lattice
Infinite lifegain triggersInfinite lifegainInfinite colorless mana that can only be spent to activate abilitiesReturn all creature cards from all graveyards to the battlefield under your controlInfinite colored mana that can only be spent to activate abilitiesInfinite card draw for any number of playersInfinite draw triggers for any number of opponentsInfinite +1/+1 counters on creatures you control
How it works
Activate Kenrith's second ability by paying 1, putting a +1/+1 counter on Cryptic Trilobite.
Activate Cryptic Trilobite's first ability by removing a +1/+1 counter from it, adding CC that can only be spent to activate abilities.