Others are a bit odd, such as the Pokmon -esque type effects that mean underpowered cards can take out bigger ones if they have a type advantage
Yata-Garasu There is a reason why Yata-Garasu is a banned card that you cant use in competitive games nowadays, as it is simply a hacked card that can make things troublesome for opponents
For example, if a creature with lifelink deals damage to you, you won't lose any life, but its controller will still gain that much life
Mostly you want to play this with Worldspine Wurm for three 5/5 tramplers at instant speed
Mirrored Flames deals 80 damage normally, but if you and your opponent both have the same number of cards in hand, Mirrored Flames deals an impressive 220 damage
The protection it gives your other merfolk pushes it ahead of the Emperor