Oxenation

whenever Oxenation enters the battlefield search your library for a creature, land, instant or sorcery card with mana value {x} or less where X is the amount of commander tax paid this game. Put that card into your hand.

-whenever an opponent casts their second spell draw a card
-whenever you cast your second creature spell proliferate up to 3 permanents
{2}{g}{t} put two land cards from your hand and put them onto the battlefield tapped
{3}{r/w}{t} copy target instant or sorcery spell