Bonehoard is at a minimum a Mortivore (power and toughness equal to creatures in all graveyards), which is already in most Type 4 stacks, and this thing generally sticks around even after you kill off the creature token
Why make extra attacks if it costs your attackers to do so
Investigate may look simple at first, but as you've seen today, it has a lot more depth to it once you start digging into the rules, the synergies, and all the different ways Magic has used it over the years
Sure, the removal effect only works on attackers, so if youre the beat down it wont feel great -- but the good news is if you are the beat down, youre probably interested in the other mode, since it pays you off pretty well for going wide
Casting Cost: Card Type: Sorcery Card Text: You and target opponent each flip a coin