Altered cards are tournament legal so long as the modifications (1) do not make the card art unrecognizable, (2) do not contain substantial strategic advice, (3) do not contain offensive images, (4) do not obstruct or change the mana cost or name of the card, and (5) cannot be construed as a marked card (must not be identifiable from any other card in a players deck)
The randomness of this ability might be frustrating to some, but for others it'll ensure their deck always feels fresh
Tricky Terrain and Tricky Terrain Collector's Edition 0002_MTGMH3_CmdFace: Omo, Queen of Vesuva 0008_MTGMH3_CmFeatur: Jyoti, Moag Ancient 0145_MTGMH3_Vanity: Omo, Queen of Vesuva 0141_MTGMH3_ComPorEc: Omo, Queen of Vesuva 0140_MTGMH3_ComPorEc: Jyoti, Moag Ancient 0149_MTGMH3_EclVanty: Omo, Queen of Vesuva Check out the cards from Tricky Terrain and Tricky Terrain Collector's Edition in the Modern Horizons 3 Card Image Gallery
And then when you pay the mana you are not playing the spell so it can't be countered then either
This also makes our scry lands later in the game much more powerful