Sozin's Comet 309 (Avatar: The Last Airbender) - Foil Brilliant Vestige [Class Bonus] On Enter: Another

[Class Bonus] On Enter: Another target ally you control becomes fostered

your champion gets -10 level

If at least three of them are crux and/or tera element

each Elf creature you control has base power and toughness 5/5 and becomes a Dinosaur in addition to its other creature types

Sozin's Comet 309 (Avatar: The Last Airbender) - Foil Brilliant Vestige [Class Bonus] On Enter: AnotherEach creature you control gains firebending 5 until end of turn. (Whenever it attacks, add {R}{R}{R}{R}{R}. This mana lasts until end of combat.) Foretell {2}{R} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)