During your Main Phase: You can destroy 1 "Memento" monster you control, and if you do, add 1 "Memento" card from your Deck to your hand, except "Mementotlan Mace"
A combination of Avarice and Benevolence
Crew 1 (Tap any number of creatures you control with total power 1 or more: This Vehicle becomes an artifact creature until end of turn.) To double the number of +1/+1 counters on a creature, put a number of +1/+1 counters on it equal to the number it already has
2 Nibiru, The Primal Being Nibiru, The Primal Being is the face of anti-Combo Deck cards
Practically speaking, the black-white Eldrazi version is the de facto consensus build, with mono-white, GW, and occasionally UW versions appearing much more infrequently