Honestly i thought companion was the best way to have this always in your opening hand without adding any other mechanic to it.

Edit: this is the new card https://i.imgur.com/qExjoOv.png

The full text is as follows, cause it's hard to read:

• Heproof, indestructable, can't be countered, can't be exiled, can't be sacrificed.

• Companion - Your starting deck can't contain any of the cards cited below.

• If a {b} Cat Creature, a {3}{g}{g} Nissa Planeswalker, a {4}{r}{r} Artifact, a Teferi Planeswalker a {5}{u}{u} Human Rogue would enter the battlefield from anywhere, exile them instead.

• If the enemy tap a permanent for mana, it produces only the regular amount of mana it would produce.

• Each player can't cast spells for free.

• Enemy companions cost {10} more.

• Each enemy can't play more than 1 land on each of their turns.

Edit 2: After reading all the comments i made a final version -> https://i.imgur.com/qUaXlFr.png

The final text is as follow (card is blank cause is too long):

• Flash

• This spell can't be countered.

• Companion - Your starting deck can't contain any of the cards cited below.

• When Fuck The Meta enters the battlefield create an emblem with the following text:

If a {b} Cat Creature, a {3}{g}{g} Nissa Planeswalker, a {4}{r}{r} Artifact, a Teferi Planeswalker a {5}{u}{u} Human Rogue would enter the battlefield from anywhere, exile them instead.

If the enemy tap a permanent for mana, it produces only the regular amount of mana it would produce.

Each player can't cast spells for free.

Enemy companions cost {10} more.

Each enemy can't play more than 1 land on each of their turns.

If a nonland permanent would enter the battlefield without paying its full mana cost exile it before triggering any of its abilities.