If it's a land card, you put it into your hand
Last but not least, Crystalize is a powerful unique ability, making it even more certain that you can target and destroy unwanted Evasive characters before they cause too much damage
This land lets you add three generic mana to your mana pool, with the extremely mild stipulation that you can only use the mana on artifacts
To summarise the combo: Cast Threefold Thunderhulk, which makes you three gnome tokens Copy it with Saheeli, Radiant Creator, which makes 8 more gnomes tokens As the copy of Threefold Thunderhulk's base power and toughness is now 5/5 and enters with three additional +1/+1 counters Attack with Threefold Thunderhulk and make another 8 gnome tokens You would be left with the original Threefold Thunderhulk as a 3/3 and nineteen 1/1 gnome tokens There is a little bonus to the Threefold Thunderhulk, as it has one more ability
Youre encouraged to use the cards in casual formats, though you can always bring this up as a Rule 0 discussion with your playgroup about potentially including cards that aren't technically legal