Buzzard-Wasp Colony

Buzzard-Wasp Colony's last ability puts all counters that were on the creature that died onto Buzzard-Wasp Colony, not just its +1/+1 counters.

If another creature you control has -1/-1 counters on it when it dies, Buzzard-Wasp Colony's ability will include those as well. This may result in Buzzard-Wasp Colony dying.

If enough -1/-1 counters are put on a creature you control at the same time to make its toughness 0 or less, Buzzard-Wasp Colony's last ability will see all of the +1/+1 counters it had when it died as well as the -1/-1 counters it had, and an equal number of each of those types of counters (plus any other applicable counters) will be put onto Buzzard-Wasp Colony.

You may end up putting the appropriate counters on more than one permanent. For example, if you control two Buzzard-Wasp Colonies when a creature dies, you'll put the appropriate number of each kind of counter onto both of them.