Simply put, ProxyKing.biz makes the best MtG proxy cards
All of that is ignoring Dockside Extortionist, too
If you want infinite mana, you need to be able to generate more than two mana this way
In addition, players were constantly attacking into tapped creatures, forgetting that a tapped creature had the ability to untap itself and block
2 Silver Trophy // $444,000 Shadowless Holo Charizard // $420,000 Blastoise Commissioned Presentation Galaxy Star Hologram // $360,000 Trophy Pikachu Trainer Bronze // $300,000 Family Event Kangaskhan Trophy Card Promo // $175,000 Toshiyuki Yamaguchi No
What interests me here is that you can still pay five mana to get most of an Austere Command without being in an Energy deck