Toggle between exact match, "at least," and exclude modes to dial in exactly what you need
As far as pure ramp goes, however, Tato Farmer is beat by a multitude of other options
If an effect says to set a player's life total to a number that's higher than the player's current life total while Rampaging Ferocidon is on the battlefield, the player's life total doesn't change
Rarity: R #: 228 Card Type: Artifact Casting Cost: 0
IF THE POISON COUNT IN EDH HAD TO BE INCREASED IT SHOULD BE CHANGED TO Apparently the simple argument that life total is doubled, so poison count should be doubled is a compelling one
Notably, even though modes on commands resolve in order, the entire effect exists as one spell on the stack