If the copied creature is a token, Clone copies the original characteristics of that token as stated by the effect that created the token
Even with no creatures, greens second favorite thing is dropping an additional land
White has impressive instants and sorceries like Beacon of Immortality, Invincible Hymn, and Reverse the Sands that generate huge bursts of lifegain
These cards regularly destroy, exile, and bounce other lands, keep lands tapped, or change what mana is produced by four or more lands per player without replacing them
I used all of my mana to summon the Walking Ballista with 12 counters and its ability meant that I could then get rid of those counters to deal 1 damage to any target
just make sure it doesnt interfere with your color commitments too much