You may want to fix the differences between the card art and the table description for the ability:
"Ice Giant enters play frozen. The enemy's weapon has a chance to be frozen while this
creature is in play." - you forgot 'creature'.
"Blizzard Giant enters play frozen. The enemy's weapon has a chance to be frozen while this is in play." - isn't correct. The highlighted parts in the statement need to match the card image.
Also, do not put
next to the 'Element' table box in your card image. Type out the word 'Water' instead to allow new players to immediately recognize that the
symbol is equivalent to the Water element.
With that said, I like this idea - it makes it SUPER vulnerable to Shockwave, a CC that I don't see as frequently as I thought (it's pretty powerful for 4 damage). Also, add into the fact that it can't do damage as long as it's frozen/congealed, it gives the opponent just enough time to possibly remove the creature out of the field through other ways (if they have spells or other creatures), unless you top it off with a Quintessence... in which case, any person that relies on their weapon (anti-deckout with eternity, or pulvy blow-outs) would be destroyed by that card combo alone.
I suppose you might have to give out a second thought about how to balance this around immortality, because locking a person out of their weapon slot completely (without spamming explosions and steals) is a bit ridiculous...