An outstanding support for some heroes, Falcon, Iceman, Phoenix and Angel each have at least 9 cards in their hero kits that Team-Building Exercise can reduce, before you even consider adding additional cards that share a trait.

Aerial and Psionic are traits that work very well with TBE, but tribal themed decks can also get a ton of value out of the card when you factor both the key allies and supports that share those traits.

Very strong dependable card. 3 ER to get 1 damage to the villain + any minions, 1 thw or 1 atk, and then chump block. Also, Squirrel Girl can be a cheap good card for Earth's Mightiest Heroes or Strength In Numbers. Very strong against Ultron.

Rating: high B (S-D)

To be combined with Air Cover (a tech), fishing Suppressing Fire from even the discard.

You will have a damage-free defeat of any non-ELITE minion in board (not necessarily the one who triggered the Air Cover).

• Unleash Nova Force, as any other things interacting with defeating enemies, can get certain extra benefit from it.

Its still kinda much conditional; it will have hard times finding valid targets in non-specific scenarios or with non-upgrade specific heroes (like Cyclops (Hero)), or even if your Air Cover is offline by the time you draw this card.

3 damage for 2 ER leaves a little to be desired, especially on a delay, but by coming in three increments of 1 damage, you can spread that damage around with perfect efficiency or remove tough statuses without wasting too much damage. This is also a Weapon that can be exhausted to Mean Swing and Firepower without wasting value. In general, the Sidearm should be attached to your hero to ensure all ammo gets used, but it can be attached to an ally. Few S.H.I.E.L.D. allies can attack three times and still be able to block, though. Deathlok isn't too strong on his own, but he is a decent way to get Sidearm into play for the Firepower deck. S.H.I.E.L.D Sidearm isn't busted or anything, but it's a nice way to increase damage output and improve quality of life for any basic attacking S.H.I.E.L.D. hero

You are basically exchanging 2ER for tutoring 2 minor cards from even the discard pile. If any, its a TECH (for Leo Fitz/Jemma Simmons and other tech enthusiasts like Iron Man (Hero))

Self updating list of TACTIC upgrades that can be attached to minions

• Agression Marked: free overkill access for Follow Through or Directed Force's strats (and other things)
• Agression Suppressing Fire: free healing for you or another player

• (Spider-Woman/Warlock) Leadership Coordinated Attack: free impunity for your team's allies
• (Spider-Woman/Warlock) Protection Pinned Down: free atk nullification for the enemy

Self updating list of TACTIC upgrades that can be attached to enemies

• Yep, its all Cyclops (Hero): Priority Target, Exploit Weakness, Practiced Defense

This card is niche yet it may have its uses. Definitively having easier access for free healing or overkill is something to be taken into account.