It can save your most important thing from removal, no matter what permanent type it is
Kinetic Ooze Kogla, the Titan Ape Krosan Grip Leatherhead, Swamp Stalker Mistakes Were Made Molder Multani's Decree Mutant Chain Reaction Myconid Spore Tender Mystic Melting Nantuko Calmer Nantuko Vigilante Natural End Natural Reclamation Natural State Naturalize Naturalize 2 (playtest) Nature's Claim Nature's Claim Nissa's Defeat
Check the Rosette Pattern Rather than use thousands of colors of ink, printers use a handful of colors in combination
Urza's Command can drop the power of other player's dorks out of nowhere, make a Powerstone, make a tapped Construct token to win the game, and then scry and draw, so I think that the Construct and scry and card draw are the default here, and that's pretty good for four mana instant speed
Archon of Emeria Archon of Emeria combines a High Noon effect with an ability that slows down nonbasic lands
Toxic Deluge provides precise control over which creatures survive the effect