dynamax charizard pokemon card VMAX - Extended Artwork Display Case Claw Slash 100 Charizard VMAX | Darkness Ablaze

In fact, in the Top Eight of Pro Tour Battle for Zendikar, the least amount of fetches in any deck was 11 and the most was 13

Some are, most are not

Emberheart Challenger also has the Valiant ability, which states that whenever it's targeted by a spell or ability you control for the first time in a turn, you exile the top card of your library and can cast it until the end of that turn

Second, void cares about a spell being warped, for example if I cast Starbreach Whale for its warp cost, and that wont trigger revolt in most cases

Yes, sometimes youll whiff on the activation, but the activated ability is just icing on the cake, and in 45+ creature decks, you should often be hitting an extra card