You get to Scry 1 every turn, which is a powerful effect, and because you will be in Green, you will be casting creatures all the time
Rendclaw Trow A gray ogre with not one, but two abilities
If you controlled a creature with power 4 or greater when you declared Ruby as an attacker, it doesn't matter whether you still control one as her triggered ability resolves
Its a nice mana sink later, sure, but what about earlier
I took about six consecutive turns this way before this screenshot, with about 40 power worth of creatures attacking each turn
For example, if an opponent was dealt 4 damage and gained 6 life during the turn, that player will have a higher life total than they started the turn with but Knollspine Dragon's ability will let you discard your hand and draw four cards