Sometimes, it is even worth it to max a lucky Pokmon just because (usually if it has 15 attack), even if it is not 90+% IV, because it is an easy investment (considering you have the candy, which in the case of legendaries, is the real issue here)
Red Shanks (ST-23) Aggressive and fast
Kenessos gives an additional scry and can cheat sea creatures into play, like Grappling KrakenGrappling Kraken
If you control no Dragons, Sarkhan's Rage deals 2 damage to you
Most Magic sets have a cycle of rare dual lands
When energy counters were designed, proliferate was specifically brought up as a mechanic that synergizes well with energy, and now we get to see that synergy in action