2014-05-29 In a Two-Headed Giant game, dethrone will trigger if the creature attacks either player on the team with the most life or tied for the most life
Legality depends on the tournament format -- Rotlung Reanimator can be legal in some formats and banned or restricted in others
Through the years, there have been countless ways to turn lands into creatures, but this always came at the risk of losing your mana sources
Grave Titan and his deathtouch rotates, but there is Harvester of Souls who would love +2/+0 and trample with his deathtouch
More broadly, you want to force ramp into uncomfortable positions
Since it's a natural follow up question about the one ability per turn use of a planeswalker You can't activate a loyalty ability of Garruk Relentless and later that turn after he transforms activate a loyalty ability of Garruk, the Veil-Cursed