mtg exile cards from the top of your library until One most busted keywords in Magic Is exile top library a

Combo = A card that is a piece of a combo deck

These were heavily played in Standard for the duration of their legality, which also sees play in Modern and Pioneer too

I do worry that there might be a bit too much tracking for a new player here, with multiple cards having multiple different types of counters, and a lot of moving counters back and forth between permanents

They are easier to get a card into but dont keep the card sealed or steady as well as top loading sleeves

Tax Collector gives you the choice of either increasing the cost of your opponent's spells on their next turn or blanking a creature until your next turn