As a card with a serious Legacy pedigree, it's always a piece or two away from becoming part of an extremely obnoxious combo
There are plenty of board wipes that cost six mana, making Catastrophe's cost not too high to pay
In exchange for removing that finality counter, you get to give Hex Parasite +1/+0 for each counter removed
If you believe size matters, and having the biggest stick makes a stronger statement, then Green is clearly the colour for you to play
Kraum, Ludevic's Opuss ability puts pressure on your opponents in two different ways: play more spells each round since the more they hold onto them to play later the more cards you get, OR : hold off on playing more than one spell a turn to keep from giving you any card advantage
Analyze Playability: Examine the mana costs and activation requirements of your chosen blue ramp cards