You may look at the top card of your library any time, and you may play lands from the top of your library.
: Radha gets +X/+X until end of turn, where X is the number of lands you control.
Radha turns your top library card into a constant resource by letting you play lands from the top, smoothing draws and fueling a lands-matters Gruul midrange beatdown. You ramp aggressively, leverage extra land drops and card advantage, then either swing with Radha (whose late-game pump can be lethal) or grind opponents out with bigger threats. The deck plays a fair, value-driven game that snowballs as your land count climbs.
Built-in card advantage from playing lands off the top, reducing flood and screw
Cheap, recurring pump that scales into one-shot kills with enough lands
Strong in lands-matters and landfall shells thanks to extra/free land drops
First strike on your turn makes Radha a resilient attacker and good blocker setter
The activated pump is mana-hungry () and slow without ramp
Vulnerable to removal that resets your commander tax and tempo
No evasion natively, so big Radha can be chump-blocked or stalled
Gruul lacks strong card draw and interaction outside of fight/burn