by Saan
Generally, you want to try to kill the Wizard if he puts out a mana siphon. When he first summons it, it is his loss - it takes around 6 turns for him to break even in that card. So go kill him.Explode is good, but you also want at least one dissolve. Sometimes, you dont have the mana for explode and still need to trash something.
Teleport is a must have, as well as an elemental cloak. I also recommend at least 1 Purify.
I also prefer Mage wand over elemental one, but having one of each is probably a good idea.
Tanglevine is good as well for helping with stupid fleeing wizards.
Deathlock is another important card for the Priestess matchup.
The other 'must haves' are more general stuff - Jinx is important for the warlock - more so than most, since the warlock relies on tempo so much. Always have a couple nullifys, bear strengths, Ways to get both a ranged and a melee defense, etc.