Looking at 12,192 cards, these are the ones that got used, ranked. These are online top 8s for the first week of May. Boros Reckoner, Burning-Tree Emisary, and Thragtusk top the list. The most notable missed cards are Delver of Secrets (no play!) and Geist of Saint Traft (8 played).
Red Deck Wins is very popular these days.
Planeswalkers are not getting heavy use and Obzedat is the top legendary. Azorious and Boros are the most popular charms. Dreadbore got used, but only so much.