Gerrard, Weatherlight Hero | Blade of Shared Souls | Phyrexian Altar

(and one other card)

Activate
Phyrexian Altar six times by sacrificing six additional nontoken creatures, adding ({4} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Cast
Misthollow Griffin by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Activate
Blade of Shared Souls' equip ability by paying ({2} magic symbol) , attaching it to
Misthollow Griffin.
Blade of Shared Souls triggers, causing
Misthollow Griffin to become a copy of
Gerrard.
Put
Misthollow Griffin in the graveyard due to the legend rule.
When
Misthollow Griffin dies as a copy of
Gerrard, it triggers, exiling itself and returning all other artifact and creature cards put into your graveyard this turn to the battlefield.
Repeat.
If you control a seventh additional nontoken creature, you may sacrifice it as well each loop to get infinite colored mana.