Update (Lorwyn Eclipsed) :
With the release of Lorwyn Eclipsed, Myr Tribal is getting an upgrade!
In: Firdoch Core , Out: Artificer Class
In: Chomping Changeling , Out: Parasitic Implant
In: Desynchronization , Out: Myr Enforcer (bonus upgrade)
In: Forsaken Monument , Out: Myr Propagator (bonus upgrade)
In: Uthros Research Craft , Out: Tamiyo’s Logbook (bonus upgrade)
In: Idol of Oblivion , Out: Symmetry Matrix (bonus upgrade)
In: Inspirit, Flagship Vessel , Out: The Antiquities War (bonus upgrade)
Firdoch Core seems average at first glance, but it counts as a Myr and that changes everything. It triggers Urtet, Remnant of Memnarch and has Myr Tribal synergy. By paying 
, it can become a creature at instant speed until end of turn, helping either offence or defence. A great inclusion for our build!
Artificer Class is a great card too, but gets cut because its last ability is mana greedy and as cost reducer it may be worse than a rainbow mana rock.
Chomping Changeling is one of the best cards for every Tribal build as it combines artifact/enchantment removal on ETB with Tribal synergy. A must-have card for our Myr Tribal build!
Parasitic Implant gets cut because it is too slow as a removal is more flavorful than optimal.
Desynchronization works wonders with our build. Since almost our entire board consists of artifacts, this acts as an asymmetric board wipe at Instant speed. It clears the path for a lethal swing while keeping our Myr safe. A must-have card for our Myr Tribal build!
Myr Enforcer is a classic, but in Commander, a 4/4 with no abilities (even with Affinity) doesn’t move the needle, so it gets cut.
Forsaken Monument is a game-changer for our Myr Tribal. It doubles the production of most colorless-producing sources, adding an additional 
on tap. Combine this with the +2/+2 anthem effect, and our army of 1/1 tokens suddenly becomes a terrifying force. Moreover, whenever we cast a colorless spell, it net us 2 life, which can be a lifesaver.
Myr Propagator gets cut because it is a notorious mana sink that often yields diminishing returns.
Uthros Research Craft is an amazing card draw engine for our Myr Tribal. We draw a card whenever we cast an artifact spell, while we charge it and it can become a hidden finisher when it becomes a creature, as it can quickly get huge with our build and it has Flying.
Tamiyo’s Logbook gets cut because it is a “pay-to-draw” effect, which needs a lot setup to be optimal.
Idol of Oblivion is a 2-mana superstar for our Myr Tribal. Since Urtet generates a Myr token every time we cast a Myr, along with our Myr Token strategy, the Idol provides a free card almost every turn.
Symmetry Matrix is a great card too, but gets cut because it is a “pay-to-draw” effect.
Inspirit, Flagship Vessel provides immediate utility. By using the Station mechanic with our Myr tokens, we can quickly grant our entire board Indestructible and Hexproof. It’s a more flexible, proactive version of Darksteel Forge that also doubles as a 5/5 Flying threat.
The Antiquities War is a great card too, but gets cut because it is often too slow, telegraphing our big move two turns in advance.
Now you can buy the upgrade cards with a click of a button!
Updates are live in the featured Myr Tribal deck.
