mtg cards like freed from the real Let's talk... Simic Combos Freed from the Real Combo:

You'll be able to look at the top card of your library at the beginning of each of your upkeeps, but you can never put it into your hand this way, even if it's a creature card with no creature type

Sometimes, though, you cast a Halana and Alena, Partners on turn three, and your opponent doesn't have removal

It was an interesting time for Arena, especially with Jumpstart: Historic Horizons

Cards like Black Lotus and the rest of the Power Nine dont really have any business being reprinted

The Mycotyrant is an Elder Fungus with trample and a power and toughness equal to the number of Fungi and Saprolings I control

But for those looking for condensed advice: the ingredients of truly fierce competitive decks are infinite combo pieces, tutors to find them quickly, resource acceleration (mana rocks) to cast all those cards faster, and cheap interaction to stop opposing combos developing