Ghalta, Primal Hunger

This spell costs {X} less to cast, where X is the total power of creatures you control.
Trample

Sandwurm Convergence

Creatures with flying can't attack you or planeswalkers you control.
At the beginning of your end step, create a 5/5 green Wurm creature token.

This spell can't be countered.
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Flash
Whenever a player taps a land for mana, that player adds one mana of any type that land produced.

Heroes' Bane enters with four +1/+1 counters on it.
{2}{G}{G}: Put X +1/+1 counters on Heroes' Bane, where X is its power.

Trample
When Pelakka Wurm enters, you gain 7 life.
When Pelakka Wurm dies, draw a card.

Enchant creature
Enchanted creature gets +7/+7 and has trample.

Target creature gets +3/+3 until end of turn. All creatures able to block it this turn do so.

{T}: Add {G}. If you control four or more creatures, add {G}{G} instead.

When you cast this spell, create a 10/10 colorless Eldrazi creature token.