pokemon charizard card first edition CGC Trading Cards Encounters a Uniquely Deceptive Fake 1st Base Set Preserved in a tamper 1st Edition Charizard value? :

Imprint, for instance, started out in Mirrodin by only having cards that were imprinted when they were first played

Watcher of Hours

In Dissension, the first group still exists, however, the second one is replaced by another group of mono-color cards (mostly creatures), which already have abilities associated to two colors, but must be played with mana of different color or otherwise the card must be sacrificed

If you flash Aboleth in response to the ETB, it's too late at that point

Since you have access to the best removal spells, it's quite easy to take care of creatures that could block Mazirek to ensure it gets in

Just like the rest of the Tag Team GX Full arts and alternate arts, this card has seen a recent spike in value and its not hard to see why