Definitely a Commander staple - I find Stifle a bit narrow but would be happy to add +1 mana in order to counter every single Commander, planeswalker, and a fair swath of other obnoxious permanents that tend to pop up a lot.
Seems like a possible sideboard player in Standard as well given all the Sparks currently at War but on balance I imagine that Negate is going to be best.
Well this does allow you to StifleLotus Field, so in that regard it’s pseudo-Ramp? Does that make it Main-deck worthy? Stifle an ultimate, counter a PW/legendary spell? Hmm, dunno.
well virtually 3 mana to potentially ramp 2 mana, looks good(looks bad if countered soo care with this ramp)