Check out the new video game version - MTG Arena. Its free to play and gives you a ton of decks to start with. Easy way to get a feel for the game and try out a lot of different cards for free.

In terms of costs for the real world version, its easy to pick up a somewhat competitive deck on a budget.

https://www.mtggoldfish.com/articles/thirty-casual-decks-und...

Also it really depends on who you're playing. If you go into a tournament you might be expected to spend several hundred on a deck. However at the kitchen table and playing with friends you can just grab a few of those budget decks and have a blast.