Sneak Attack by paying ({R} magic symbol) , putting
Diamond Lion from your hand onto the battlefield.
Activate
Sneak Attack by paying ({R} magic symbol) , putting
Garna from your hand onto the battlefield.
When
Garna enters, it triggers.
Holding priority, activate
Diamond Lion by tapping and sacrificing it, adding ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Activate
Phyrexian Altar by sacrificing
Garna.
Resolve the
Garna ability from step 3, returning all creature cards that were put in your graveyard this turn to your hand.
Repeat.
Activate
Sneak Attack by paying ({R} magic symbol) , putting
Garna from your hand onto the battlefield.
When
Garna enters the battlefield, it triggers.
Holding priority, activate
Phyrexian Altar by sacrificing
Garna, adding ({R} magic symbol) .
Resolve the
Garna trigger, returning it from your graveyard to your hand.
Repeat.
Notes
You can repeat this loop with any number of additional creatures. This will require the desired creatures to either be on the battlefield already, or to be in your hand with an additional ({R} magic symbol) available for each creature. Simply play all other creatures with
Sneak Attack before
Garna, and then make sure to sacrifice them all for ({R} magic symbol) before resolving
Garna's trigger.
Results
Infinite ETB.
Infinite LTB.
Infinite blinking.
Infinite colored mana.
Infinite death triggers.
Infinite recursion of creature cards in your graveyard.