what pokemon card sets have charizard TCG: Mega Ultra-Premium Collection Pokemon TCG Charizard Ex Super-Premium

Not all that long ago, we saw Felidar GuardianFelidar Guardian emergency-banned from Standard on account of its interaction with Saheeli RaiSaheeli Rai: use her second loyalty ability, and you can create a hasty token copy of the Guardian, which can flicker Saheeli, bringing her back to the battlefield with her default 3 loyalty counters, and enabling her to -2 afresh

The only thing that really holds them back is the six mana buy-in

But that's not all, it also has a couple of other abilities

I then used this [On Play] effect to negate its effect

Timing restrictions based on their types are ignored

But there wasnt a clear incentive to the shadow mechanic back then