Ekthi, Contaminator Priest + Sword of the Meek + Krark-Clan Grunt
Ekthi, Contaminator Priest
Sword of the Meek
Krark-Clan Grunt
Infinitely powerful creature until end of turnInfinite artifact ETBInfinite artifact LTBInfinite artifact sacrifice triggers
How it works
Cast Sword of the Meek by paying 2.
When Sword of the Meek enters, its living weapon ability granted to it by Ekthi triggers.
Holding priority, activate Krark-Clan Grunt by sacrificing Sword of the Meek.
Resolve the Sword of the Meek trigger, creating a 0/0 Phyrexian Germ creature token. It'll enter as a 1/1 due to Ekthi's static effect.
When the Phyrexian Germ enters, Sword of the Meek triggers, returning Sword of the Meek from your graveyard to the battlefield attached to the Phyrexian Germ.
Repeat from step 2.
This loop turns the humble Sword of the Meek into a recursive engine by using Ekthi, Contaminator Priest to constantly hand it living weapon, spawning a fresh Phyrexian Germ token every time the Sword enters the battlefield. Thanks to Ekthi, Contaminator Priest pumping that Germ into a 1/1 upon arrival, it instantly triggers Sword of the Meek to leap straight back out of your graveyard and onto the token. While the stack is still sorting this out, you can feed Sword of the Meek directly to Krark-Clan Grunt, cashing in the artifact for a permanent +1/+0 boost and first strike while fueling an infinite stream of sacrifice and entry triggers.