Just note that the second (and ongoing) time you use it, this card is banished instead of going right to the graveyard
More ways to remove counters include Ferropede, Medicine Runner, Power Conduit, Scholar of New Horizons, and Vampire Hexmage
Bicycle Playing Card Dimensions The bicycle playing card dimensions are the same as poker game cards
If you have your commander on the battlefield, just casting good backup cards like Boon-Bringer Valkyrie or Death-Greeter's Champion with some small creatures is devastating
Creature Human Wizard When Spellseeker enters the battlefield, you may search your library for an instant or sorcery card with mana value 2 or less, reveal it, put it into your hand, then shuffle