Well, Trumpeting Carnosaur helps solve that problem, since you can pay three mana and discard it to kill Archon
He becomes more overshadowed with the Level 10 staples "Leo, the Keeper of the Sacred Tree" and "Star Eater", which although weaker they aren't restricted by Tuners as well carrying protection against several other effects
Firing it off at instant speed is also important, especially for targeted removal
The Walls of Ba Sing Se Speaking of high mana cost, colorless permanents that work well in a wide range of different decks, meet The Walls of Ba Sing Se, and yes they are tall, aren't they
A screenshot from Jurassic Park seemed appropriate, and there's more interesting ones lined up for upcoming weeks - I really think you'll like them
Perhaps that is why Sean is playing 3 Blade Knight, a powerful card in shorthanded positions