Not sure if such an effect for a permanent would immediately fit current Gruul builds in constructed formats, but the possibility for practical use is there
Erode, Requiting Hex, and Tragic Trajectory are all efficient removal options, which let you generate big tempo swings
In Commander, Chandra, Torch of Defiance is most comparable to Outpost Siege: both are going to be used primarily to draw you cards
Having access to this with cards like Sythis, Harvests Hand in the command zone means you cast an enchantment, draw a card, the enchantment enters, and you can play a land from your hand
5 Riptide Gearhulk Borderless - $83.65 A bit of a bomb that will no doubt make a huge splash in decks that love to blink cards, Riptide Gearhulk has a ton of potential to cause problems for your opponents
You can give your team Islandwalk with Master of the Pearl Trident and then give them an Island if they don't have it with something like Phantasmal Terrain or the Merfolk Tribal Instant Aquitect's Will