Ikoria: Lair of Behemoths is packed with exciting new mechanics, but the mechanic thats made the biggest splash is a returning one: cycling
The most balanced decks all have some sort of synergy to them, though you can pretty much base any deck off of your favorite Pokmon
If you're looking for a card to get the job done quick and easy, look no further than Chocobo KnightsChocobo Knights, because a lot of counters make for a lethal attacker, but a lot of counters and double strike will end the game in a blink of an eye
Read More: Tired of Standard
Its fairly common for the rarest cards to add an additional visual element that mark their rarity
In addition, there have also been some campaigns and promotions held which have ultimately led to the creation and distribution of cards which have ended up being just as ridiculously rare and thus mega-expensive