Without getting into too many details, this basically makes it more likely youll have an opening hand with an appropriate land-to-spell ratio and makes it less likely youll have the extreme one-landers or six-landers
This happens automatically and the card is then considered to be a new permanent
Counterspell (Ice Age/Alliances, Tempest/Stronghold/Exodus, Masques/Nemesis/Prophecy) Counterspells are decent in limited, but by no means the be-all, end-all of the universe
It even has a backup Bazaar in the event the first one gets Strip Mined, or it can be discarded to the first Bazaar activation (along with Deep Spawn and one of the freshly drawn cards)
If you counter a problematic permanent before it enters the battlefield, it ends up in the graveyard same as if it had entered the battlefield and you removed it
Aetherworks Marvel lets you pay six energy to cast a free spell from your top six cards