Other land cycles are useful, like the Triomes (Xander's Lounge) that count for three basic land types and the cycling lands like Fetid Pools
One thing we quickly found in testing London mulligans in Modern was decks that couldn't have a reliably good draw off five cards didn't gain a lot
3) Patchwork Banner Patchwork Banner is a low-cost, high-value artifact
In summary, Ive a lot more to say on this subject than the colors weve already covered
Legendary Creature - Warrior Elf Phyrexian Ozolith, the Shattered Spire If one or more +1/+1 counters would be put on an artifact or creature you control, that many plus one +1/+1 counters are put on it instead
In every zone except the stack, and while on the stack not as an Omen, an omen card has only its normal characteristics