special guest cards mtg Most Valuable Guests In Special Guests (SPG) Card List

Gaining vigilance any time after the moment you choose to attack with Aang, A Lot to Learn won't cause him to become untapped, and losing vigilance after that time won't cause it to become tapped

Elementalist's Palette This three mana tapper of any color like a Manalith is next

You can only ever sacrifice permanents that you control

WotC seem to be aware of this potential resistance to boast, and have compensated by making the effects so far very powerful for their cost

To do this, they tend to focus in only a few creatures - even so far as to go down to just one - and to stack as many boons and boosts, enchantment and equipment and send them across the board