Four mana is never a problem, and two cards for an outdated mana rock is a wonderful deal, especially when it taps for a color
Im gonna share with you my top 10 Dragons of Tarkir cards that I think will see plenty of play (Yes), 10 cards that I dont think will see immediate success or are worse than they might appear (No), and 10 speculative picks that could be good under the right conditions (Maybe So)
Once Subira's last ability resolves, check to see if the delayed triggered ability should trigger based on the power of the creatures immediately after damage is dealt, not based on their power as the ability resolves
It's also not overly expensive and is evasive on its own
The second effect allows the player to add either a white or a black mana to their Mana Pool, but the Murmuring Bosk then deals 1 damage to the player
Gavin and his team understood the assignment and quickly experimented with all the various ways to "one shot" a player in MTG