Gabriel, Renowned Tactician

The first instant or sorcery spell you cast each
turn has convoke.

Whenever Gabriel does combat damage to a player, look at the top X cards of your library where X is Gabriel's power. Put half X rounded down into your hand and the rest on the bottom of your library in a random order.

{w}{r}{g}: Gabriel gains +X/0 until end of turn where X is Gabriel's power. Activate only once each turn.