Six mana to buff your board during attacks isnt doing too much
This deck would cast Squandered Resources, sacrifice all lands to Natural Balance, then cast Cadaverous Bloom, and then pitch cards to generate mana and draw more cards
To incentivize this, there are various achievements related to filling out your card collection, such as total cards from a set collected and achievements for themed collections
Relentless Assault creates an additional combat and main phase only if it resolves during a main phase
That said, this is the highest price that Tombstone Stairwell has ever been in the last 15 years, and by a significant margin
Game Changers are prohibited in Brackets One and Two, and unrestricted in Brackets Four and Five