MTG

So Gandalf's damage ability doesn't count towards commander damage. Commander damage is only from when a commander deals combat damage to a player via attacking.

You want the cheapo hard counters like Arcane Denial, Dispel, Mental Misstep, Red (or blue) Elemental Blast, etc. Basically, counters in EDH can be rather subpar because you have multiple opponents and you're 1-for-1'ing. You and the owner of the countered spell are each down a card, while the other players are the same. They means you want them to be cheap or have draw/replacement effects on them. tl;dr-- holy fuck get rid of that Cancel it hurts my eyes.

For draw spells, there's Treasure Cruise, Gitaxian Probe, Brainstorm, Ponder, Preordain, Windfall, Prosperity, Narset Parter of Veils, Lorien Revealed, Frantic Search, and some others I'm forgetting. One trick is to combine Ponder and Brainstorm with a shuffle effect from cards like Merchant Scroll and Scalding Tarn to act as an Ancestral Recall.

And for fuck's sake where is you Command Tower and Sol Ring? That's how every deck in EDH should start lol. Both have been printed into oblivion so you should buy them for dirt cheap. Go do that. Like right now before you do anything else Magic related. Hell, someone might just give you one if you ask nicely.