Format rotations can crater competitive staples Clara SR lost 41.46% after becoming tournament-illegal
It was fixed in beta, but the problem is, at the time, the rules was that the cards did what was written on them
Man, long Standard rotations are brutal for Spree
So, in the lategame it's a 4/6 that draws two cards, and the synergies with Ephemerate are also excellent
Your opponents will be trying to do the same thing, and this creates a scenario where you'll have to try to think what you believe the other people will do, and they will be trying to do the same
The most detrimental aspect of a dragons playability is the fact that although very powerful, they usually cost 5-7 mana, and those expensive spells tend to see more EDH or sideboard play than as main deck Constructed inclusions