Add an amount of mana of that color equal to the number of creatures you control of the chosen type
Trample is broken with deathtouch, since you can deal just one damage to each creature that blocked it and overflow damage to a player, so I have a few ways to grant it
If the creature that entered the battlefield leaves the battlefield before the ability tries to resolve, use its last known power and toughness to compare the stats
Since it's a mana cheap instant, you can do this in response to targeted or sweeping removal to get cards, as a sacrifice or it can send something to your graveyard about to get exiled by Swords to Plowshares, or to get value out of a chump blocker about to die anyway
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