This is a pretty narrow card but has some specific uses. At face value, getting a tough status is about neutral with discarding an ally (who could otherwise block an attack for you). Cancelling those out, we get probably 2-4 points of healing for 2 ER...not super exciting. The way to mitigate the downside of discarding an ally is if the ally couldn't stick around to block for you anyway. This could be because you got it off "To Me, My X-Men!" or Sneak Attack, for example. Grant Ward is an ally who is strong the turn you play him, but you actively want to get him off the board before the villain phase (and he can't block). Noble Sacrifice can also be tech against any ally-punishing scenario such as Unus or whenever the villain has overkill. Occasional access to tough statuses goes a long way in those scenarios. Lastly, Drax is a hero who wants the villain attacking him, not an ally, so the downside of Noble Sacrifice is mitigated and the effect is highly useful. By no means is this card a staple, but it provides a uniquely powerful effect for several specific situations.

I assume no one has ever reviewed this card because no one has ever played it in a deck?

Exhausting two characters instead of one to avoid damage is costly on its own. Forget that you would have to have a Guardian and Avenger both in play. Maybe w/ Starlord handing out the keyword, but who plays Starlord Protection???

Preemptive Strike only costs one and can deal all boost damage back to an enemy. So why would you ever pay three more AND exhaust two characters to add the villain's attack. Best used as card divider rather than in your deck.

Love using this on Three Steps Ahead and Gunboat Diplomacy. It's also great in a S.H.I.E.L.D. deck with Homeland Intervention and Global Logistics. As the game grows, there will probably be even more cards that end up making these Training cards shine.

This is basically Magic Shield, but better. It costs 1 more resource but it negates all incoming damage, instead of just 3. It can also only be played in hero form only, but that's not an issue since Cable doesn't need to flip often. The downside is that there's only 1 copy available.

It is also similar to Telekinetic Shield. You may be able to get more uses out of Phoenix's card (stacking up ping dmg, until it exceeds 5, thus utilizing its full potential), but Cable's doesn't have to be attached to a character.

I really like this overall. Useful for preventing big bursts of damage and is both psionic and a superpower, so you can combine it with Psimitar or retrieve it with Hope Summers.

One of the most efficient hero of the game for true solo. Its synergy with X-23's Claws, Honey Badger, Protection's Protective Training and Rogue is a killer one, a kind of Quicksilver or Captain America without shield but with claws ! Unlike most heroes, all its specific events do not deal autonomous effects, they need basic activations to operate. So, the more readying (and healing) X-23 and Honey Badger get, the more rushy and fun their combo is.