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#3. Crystalline Oracle
Expansion: Journey to Un'Goro
This little guy has the same tier score in Heartharena as Obsidian Statue! Crystalline Oracle has the same effect as a Thoughtsteal but the 1/1 body is useful to play on turn 1. Even though it is very RNG based, the value of a card from your opponent's deck has more value in Arena. You could get something useless like a Deadly Poison sometimes too, but even copying a Neutral minion is useful.
#2. Free from Amber
Expansion: Journey to Un'Goro
Free from Amber is a spell that has so much value in Arena. You can discover an 8 cost to 10 cost minion for a potential discount. You can summon a Taunt to keep you safe, a giant dragon such as Ysera or anything else to help your situation and board.
Most minions that cost 8 and above, including the giants, are pretty well statted and there are very few bad ones. You might sometimes get a Togwaggle but the Discover mechanic gives you better odds with the other two.
