Lord of Elementals

Lord of Elementals enters the battlefield with X +1/+1 counters on it.
Double strike, Trample, Haste
When Lord of Elementals attacks, you may put X +1/+1 counters on up to X target lands you control, they're 0/0 elemental creatures. Untap them.
Whenever an elemental creature you control attacks, it gains double strike and trample until end of turn.