Having an Energy-gathering Ability alongside an Energy-based stacking Attack makes this card worth looking into as a competitive player
Tezzeret, Cruel Captain Id be remiss if I didnt talk about Tezzeret, although in all honesty it never really did that much for me, although my cube doesnt have fast mana (which is likely part, but not all of the reason why.) The reason was that it mainly played as an expensive tutor that got a cheap artifact and didnt do much else, since his + ability usually was just used to keep him alive
Since then, it's boomed in the West to become a duelling competition in real life, with tournaments and trading cards being held ever since
C Common MR Mosaic Rare Spacegate X TRAP Continuous Each time a monster your opponent controls attacks or is attacked, place 1 Gate Counter on this card at the end of the Damage Step
The set balances tech cards and heavy hitters, expanding on themes without going off-course