#1. Ultimate Infestation

Expansion: Knights of the Frozen Throne
Ultimate Infestation is the best card any Druid could draft in Arena right now. It acts a removal, armour gain, a body summon and ridiculous Draw 5 cards. Card draw is the strongest mechanic in the game but drawing 5 cards in Arena has an insane amount of value, even if you are consuming a full turn to play this card.
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Honourable Mentions
Webweave

Webweave, even though expensive, summons 1/2 spiders with poisonous which can pose to be a great threat to your opponent.
Bittertide Hydra

Although Bittertide Hydra is a neutral card and has the downside of dealing 3 damage to your hero, it has great synergy with Druid and fits perfectly well. It is a low cost, high statted minion which poses a threat to your opponent. Druids have enough armour gain to survive the downside as well.
Stoneskin Basilisk

A really great neutral card in Arena, Stoneskin Basilisk helps Druid in the area they are lacking: target removal. It poses a big enough threat and is much harder to kill.
Tortollan Forager

Tortollan Forager does not seem like a very great minion at first glance. It is an average statted 2 drop but it also gives you an additional stronger 5+ attack minion you can use for later. This is a little dependent on RNG, but there are usually good 5+ attack minions which are useful.
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