On creatures, Bargain often functions as an additional enters-the-battlefield effect
However, you get a poison counter on your every upkeep that it stays on the field
In the official announcement article, Wizards noted that these cards are getting the hammer Due to their power level, ability to accelerate mana, and/or status as free spells. The latter point easily explains two of the pre-bans here, Fireblast and Pyrokinesis
But here's the catch--we're not talking about one-off draw spells here
It gains haste (This creature can attack, and as soon as it comes under your control.) until end of turn
Emrakul, the Aeons Torn is a 15-mana flying 15/15 that cant be countered, gives you an extra turn after you cast it, has protection from cards that have colours and has Annihilator 6