Even when you do them both for five the Shreikmaw has comparable evasion, a not wildly lower amount of power and has no upkeep costs
Sure, a lack of enters ability means it wont make waves at high power levels, but its a great low-powered and budget-friendly alternative to something like Consecrated Sphinx or Rhystic Study
Simba - Adventurous Successor and Hypnotic Strength are both great cards for raising the Strength stats on other cards, as when they are played, the player can add +2 Strength to a chosen character
Hazel's only weakness is that two life for an influx of mana is a high price to pay if you plan to be using it on a frequent basis
You also see Kaheera in the sideboard of white control decks that meet the companion requirement by not playing any creatures
This is due to the fact that the Urzas Saga Arena Island has two variant prints out there: one with the set symbol, and one without it