If you want to play a five-mana card, youll have to wait until turn five to do so assuming you draw enough lands
If youve played trading card games like Magic: The Gathering or Pokmon before, you know that setting up your deck beforehand is key
The countermagic suite includes the classic Counterspell, some cheap interaction in An Offer You Can't Refuse and Swan Song, and Strix Serenade to prevent other commanders from hitting the board
Here are a few options that each one can search: Trinket Mage - Esper Sentinel, Sensei's Divining Top, Shadowspear Tribute Mage - The Soul Stone, Arcane Signet, Grinding Station Trophy Mage - Buster Sword, Extraplanar Lens, Simularcum Synthesizer Transit Mage - The One Ring, Roaming Throne, Iron Man, Titan of Innovation Tribute Mage - The Great Henge, Knowledge Pool, The Immortal Sun #3 - Harmonic Prodigy Harmonic Prodigy