I’ll go through all the cards and speculate:
Zor
Seems pretty mediocre. A 2 mana 2/1 that you cannot control is far from amazing and the extra card has a 1/6 chance of being absolute trash (Alter Rex). In a mech deck, drawing extra mechs might be good enough, but the 2/1 body really hurts since mech pieces are low tempo drops already
Gauntlet rating: 4/10
Ironcliff Heart
Now we are talking! this card is excellent for reigniting those dispelled Silverguard Knights and damaged azurite lions. The fact that this costs 4 mana does hurt, since the 4 slot is very competitive in Lyonar, but this seems good enough to see play in at least one deck. Remember that transforming a minion keeps it active, so you can do this + divine bond for a 7 mana 13 damage combo if anything sticks.
Gauntlet rating: 7/10
Natures Confluence
With little information on battlepets, this card is difficult to judge. If the average battle pet is as good as a 2/3 minion, then this card would be pretty darn good. If this pulls Zor, then that would be amazing, since it essentially draws 4 cards while giving some small bodies. Remember that the battlepets essentially have airdrop.
Gauntlet rating: 8/10
Arcane Devourer
Pretty darn cool! The effect requires you to be at at least 8 mana and hold a high (5+) cost drop. the statline complement the ability prefectly since 4 damage is very hard to do while also dealing with the threat that it brings out. Finally some love for Lilith!
Gauntlet rating: 5/10
Battle Panddo
Holy poptarts! As if Songhai needed another strong 3 drop. Effectively, this thing has 3 attack with the ability. From Ghost Lightning and Blistering Scorn, we already know that the “deal 1 damage globally” effect is very valuable. The fact that this minion could pull off this effect multiple times makes it very likely to see play even in decks already running Lantern Fox.
Gauntlet rating: 9/10
Pantherian
Seems pretty mediocre with the current iteration of the Scion spells. If you manage to cast this for 0 before turn 7-8, then it would be pretty strong, but it requires you to draw and play all three Scion spells. The first and second wishes are easy to fit into many decks, but casting the third wish may be a bit problematic. I do not see this card seeing play unless either the dervish tribe receives a massive amount of support or third wish is changed to something more playable.
Gauntlet rating: 2/10
Winter’s Wake
Another card that is hard to judge seeing how we do not know what walls will be introduced. This is only valuable if it hits three or more walls. If there are more wall generating effects in Shimzar (like White Asp or minions that place walls) then this may lead to a new archetype of Vanar.
Gauntlet rating: 1/10
Inquisitor Kron

Pandora as a 7 cost 3/10 that summons a 3/3 minion with a random ability at the end of turn. This is like Pandora, Except it costs 2 less, has a better stat line for its cost, has provoke to protect its summons, and summons minions immediately. Remember that Right now, Pandora is the go to lategame drop. While a 2/2 is significantly worse than a 3/3, Kron’s provoke protects them, making the flying, ranged, frenzy, and celerity minions better and the provoke one worse. This is assuming that the keywords on the prisoners are the same as those on Pandora’s wolves. If this card also pulls forcefield, rush, and maybe even faction or new keyword minions, then it would be even scarier. To add icing to the cake, it has Synergy with replace mechanics!
Gauntlet rating: Quite possibly the best card in Gauntlet. 10+/10