This actually came as a surprise to me, as conditional mana ramp that adds extra hoops to jump through beyond having fewer lands than your opponent is almost always unplayable, but when that hoop is take this creature off the battlefield, and the reward is both ramp and potentially filling your hand with any land with the Plains subtype, the results are surprisingly effective
He draws you cards, and gives you 2 life while he does so
What does this mean
When you can put a +1/+1 counter on any creature you control with lifegain triggers, you have a much more flexible card, and you can enable lots of interactions in +1/+1 counter-matters decks
Temperamental Oozewagg It may be a common, but Temperamental Oozewagg can have a strong impact just by sitting on the battlefield
In Modern, the closest you can get is the referential kicker on Tourach, Dread Cantor