You can always swap decks to try out different strategies, and treat these as a base for building on
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Mana Drain (Legends) No, and There are many counterspells in MTG, including one literally called Counterspell
This will be good for Bounce decks and big characters alike
(Also, Sol Ring is a 1-drop, and most ramp really starts on turn two, so I think it's better to think in terms of what we can reliably get, rather than luckily starting with one of 99 cards.) So, let's say I'm building around a 5-drop Commander who really needs to be on the 'field before I can start doing my thing
Kaalia is has been among MTGs best commander decks for a long time because cheating mana costs is almost always broken, so with Kaalia you want the biggest, baddest creatures of the types you can find, like Avacyn, Angel of Hope or Vilis, Broker of Blood