Keyleth, Voice of Tempest

at the beginning of each combat choose one:
Keyleth becomes an air elemental with power and toughness 4/4 and gains flying until end of turn.
Keyleth becomes a fire elemental with power and toughness 3/3 and gains haste until end of turn.
keyleth becomes an earth elemental with power and toughness 4/5 and gains vigilance until end of turn.
keyleth becomes a water elemental with power and toughness 2/2 and cannot be blocked until end of turn.