Anzrag, the Quake-Mole

(and one other card)

Card Preventing Combat Damage Dealt To/By a Creature

Anzrag on the battlefield.
Card Preventing Combat Damage Dealt To/By a Creature in hand or on the battlefield.

({3} magic symbol) ({R} magic symbol) ({R} magic symbol) ({G} magic symbol) ({G} magic symbol) available.

Activate
Anzrag by paying ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) ({G} magic symbol) ({G} magic symbol) , causing opponents to block
Anzrag if able this turn.
If needed, cast the card preventing combat damage by paying its mana cost or activate it.
Declare
Anzrag as an attacker, attacking an opponent who controls a creature.
The opponent is forced to block
Anzrag, triggering
Anzrag, untapping all creatures you control and causing you to get an additional combat phase after this one.
Any combat damage that would be dealt is prevented due to Fog.
Repeat from step 3 each combat phase.

Depending on the card used to prevent combat damage, additional mana and pre-requisites may be required.