If you have green (mid-power): 2-mana land ramp (Natures Lore, Three Visits, Rampant Growth, Farseek) 3-mana smoothing ramp (Cultivate, Kodamas Reach) 2-mana rocks for fixing (Arcane Signet, a signet or talisman) If you dont have green (mid-power): Sol Ring Arcane Signet 2-mana fixing rocks (signets, talismans, Fellwar Stone) 2-mana utility rocks (Mind Stone, Thought Vessel) A small number of 3-mana rocks only if they do something extra For the full rock breakdown, crosslink to: Mana Rocks in Commander MTG: Best Legal Options (and the traps)
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Portal Manipulator's the latest in this line-up, with the ability to completely reshape combat
Generally I shy away from effects like this, especially with +1/+1 counters just not being very good if that's the focus of your deck