The Deserted Spirit

Reach (able to block creatures with flying)
{t} Deserted Spirit turns all untapped mountains
into 2/2 Goblin Tokens with Reach and Trample
for 1 turn. If a token dies, it becomes a land again
When The Deserted Spirit dies, put 3 3/3
counters on each goblin you control
and target opponent loses 3 health