guile mtg card Sleeper's [Urza's Legacy] put a charge counter on him or remove one from him MTGNexus - Guile, Sonic Soldier

Include a mix of color-fixing lands, utility lands, and basic lands for a strong mana base

It was even the target of the nerfs for the new Alchemy format, and its still making a LOT of noise there too

Others, like blacks relationship with mana acceleration, have undergone a surprising amount of change in terms of how many cards they receive with the ability to generate extra black mana and how comparatively restrictive they are versus a card like Dark Ritual, one of the first and strongest go-tos for mana acceleration during Magics early years

Even with the once-per-turn restriction, which prevents easy infinite loops, the incremental advantage is staggering