You may reveal a creature card with mana value less than or equal to the number of lands you control from among them and put it onto the battlefield
Pairing it with trample enablers like Rancor or Whispersilk Cloak to make it unblockable turns it into a deadly finisher
This is great for a control mirror match, as it completely shuts down your opponent's ability to counter your spells while you still are able to counter their spells
For this added cost, you get a ton more value, as Sephiroth can easily draw you a card upon entry
Recent sets have introduced build-arounds like Insidious Roots, Kishla Skimmer, and Quintorius, History Chaser, inching this strategy ever closer to critical mass
The classic is Devoted Druid, moving a -1/-1 from it so that we can perform untap shenanigans