Sisay is a three-mana White 2/2 who gets +1/+1 for each color among other Legendary permanents you control
Keruga, the Macrosage Playing cards with only mana value 3 or greater can be somewhat hard to do, but in some cases, Ive seen decks like the ones using Fires of Invention and adventure cards like Bonecrusher Giant to have some early play
So if you have ways to sacrifice creatures for value something that Grixis (blue/black/red) has plenty of ways to do you can get even more value out of them
Interestingly, BG has a Meld pair in Vanille, Cheerful ICie, and Fang, Fearless ICie, both of whom combine into Ragnarok, Divine Deliverance
The average Mythic printed today is 2.5 times more tournament playable than a Mythic from Shards of Alara block
watch out for cards like Elvish Champion and Triumph of the Hordes to potentially seal the deal