One thing that makes encounters with wild Pokmon so interesting is the opportunity to catch and add them to your team
The first of the Pot cards to be released after Greed, and it's polar opposite in effect, name, even artwork
(6/22/2015) If you activate Gideon's third ability and then damage is dealt to him that can't be prevented, that damage has all applicable results: specifically, the damage is marked on Gideon (since he's a creature) and that damage causes that many loyalty counters to be removed from him (since he's a planeswalker)
Eventually, the cost was high enough that the team felt it was just neater as a double Time Walk
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If aggro is powerful and good and ubiquitous, as with the Embercleave days of Standard mono-red, midrange strategies have to tip more towards cheap spell-based removal