So mtg at a competitive level has trouble with high costing cards. They take up a whole turn and sit in your hand for a long time until you can play them.

As such anything over four mana needs either a huge amount of value or an immediate effect to be playable.

So my thought was, why not make high power cheap cards, that can only be played after a certain number of turns? A general rule of thumb would be a 1 mana reduction for every 2 arrival.

Arrival X: This card can only be cast on your X turn or later

Example: Arrival 4 can only be played on your fourth turn or later.

Example card:

Voodoo Gravetender - 1B

Arrival 4

Whenever a creature you control dies, summon a 2/2 Zombie creature token.

2/3

So this card cannot be played turn two, and has to wait until turn four to be played, but as such gives you a higher power turn later in the game.

Another example card

Territorial Dragon 1RR

Arrival 5, Flying

When Territorial Dragon enters the battlefield, it does 4 damage split amongs creatures and players of your choice

5/4

Thoughts? It does seem a bit strong for cheat decks like Collectve Company, but maybe add a clause for if it enters the battlefield and isnt cast, exile it?