Timing rules still apply.) Legendary Creature - Wizard Merfolk Recursion (CTRL to add secondary) Removal Basilisk Collar Equipped creature has deathtouch and lifelink
Partner (You can have two commanders if both have partner.) Legendary Creature - Human Rogue Viral Spawning Create a 3/3 green Phyrexian Beast creature token with toxic 1
It makes the most sense for high-value, rare cards that are in near-mint condition, as a high grade can significantly increase their price
On the other hand, in a buster mode-centered deck, you can bring in buster mode, but if you prefer a buster beast that searches for buster mode while sending buster mode monsters to the graveyard, it is a useless card in a buster deck that cannot continue development even if the level 2 is special
Your biggest problem will be defending Teval, who has no protection against removal, will suffer when cards are exiled, and who must constantly jump into the fray of battle