It means youve got to be a little more savvy when building your MTG deck, and either include cards you want in the graveyard or be able to decide on the spot what youre not going to need
If Compy Swarm leaves the battlefield before its triggered ability resolves, the token will still enter the battlefield as a copy of Compy Swarm, using Compy Swarm's copiable values from when it was last on the battlefield
One of the things that appealed to us about companion was how it let you pick a monster to team up with and build a deck around
While this does give plenty of options for what kinds of cards can go in a player's deck, having a high number of cards can also make it harder to get a card you need from a draw
As a result, Tibalt, the Fiend-Blooded rarely appears in any decks
Its not the same as it was five or even three years ago