Which card reward should I pick for level up?

I am still new to the game. Here are the cards that I was offered, which one should I pick?

Radiance is by far the best out of these three.

Sharra kinda sucks (unless you carry her in monogreen and it’s a mirror match) and Baron Thulgar can actually be more harmful than helpful in many matchups with that Last Word ability.

for future reference, there are tier lists for all the cards linked at the bottom

Big thanks, there are tier lists of cards on other raritys as well, really helpful. A lot of the information are surprising. A lot of the cards I thought were good are not and a lot of cards I thought were “decent” were actually S tier.