These are not just number one for 2002 but arguably for all 25 years of magic
Conquerors Flail Conqueror's Flail grows stronger for each color among permanents you control and, once equipped, it shuts off opponents spells during your turn, so your attacks and combos go off without disruption
Simply open up the shopping cart menu and press R
The immediate benefit can be good, but its value really lies in the freedom to plan your turns around alternating between Kayas first two abilities to buff your tokens with a +1/+1 counter plus deathtouch (a relatively rare ability among tokens), and doubling the number of tokens you create
Terra, Magical Adept is also a viable choice for a commander for a Gruul deck, but Terra, Herald of Hope is arguably the better commander card for the character
Consider, Mijae Djinn from Revised is typically worth around a buck