Since fighting includes Ground-types which resist electricity, an all-Ground deck could take him out (slowly) with little to no danger (until Zapdos comes up, in which case you'd better have one that does at least 40 damage or have a Colorless/'splashable' Pokmon that has a different type)
The exception to this is when you create a token copy of another object
7 +1/+1 Counters While mostly a green mechanic, hence its representation in Kenriths green-aligned ability, +1/+1 counters are present across cards of all colors
Any deck that can recur lands from the graveyard should consider this, and any deck that makes squirrels should see this as their ideal finisher
Most of the banned cards were either combo pieces that proved to be too strong or cards that shut down other strategies entirely due to how powerful they are
Commander drives most of the sales these days, but the other Constructed formats using a card will also affect its price and can make that card resistant to rotation dips