If the ability doesn't resolve (either for having its target become illegal or because a spell or ability counters it), the mode chosen for that instance of the ability still counts as being chosen
5 Kaldra Summoned by assembling, Infinity Stone style, three pieces of legendary equipment, Kaldra is a pulsing plasma Avatar from Fifth Dawn
Similarly, if the ability causes a permanent with station to become an artifact creature, putting an amount of charge counters on it greater than or equal to the amount required for it to become an artifact creature wont overwrite the base power and toughness set by Depthshaker Titans first ability
Modern Horizons 3 contains the 5 basic lands (Plains, Island, Swamp, Mountain, and Forest) with variant treatments, plus an uncommon Snow-Covered Wastes (included as one of the 101 uncommons) with its variant treatments
What are your favorite targets for your creature tutors