How many times have you seen someone sit at three life, unable to play a spell because they knew his opponent had an Undermine in his hand
With your elves multiplying and powering each other up, your opponents will struggle to keep pace with your overwhelming board presence
A curse is just another name for an unwanted blessing
While "Dragon Ravine" is locked to only Dragon-Type Monsters, many Dragon Monsters have powerful Graveyard effects
Pikachu vs
While just enchanting things for value is a fine, fun way to play Estrid, the Masked, things can get out of control quickly if you start playing cards like Overgrowth and Fertile Ground so that Estrid's +2 acts like a massive ramp spell, and then The Chain Veil (perhaps enchanted with a Mask aura thanks to Estrid's 1) give you an easy way to activate your Estrid, the Masked an infinite number of times, potentially making infinite mana by untapping your lands and eventually winning with her Replenish ultimate