Each creature that's a Barbarian, a Warrior, or a Berserker gets +2/+2 and has haste.
Lovisa is a mono-red tribal payoff that pumps every Barbarian, Warrior, and Berserker by +2/+2 and grants them haste. You flood the board with cheap aggressive creatures early, drop Lovisa around turn five to immediately swing for huge hasty damage, and close fast before slower decks stabilize.
Massive board-wide anthem (+2/+2) that turns small creatures into real threats
Haste lets fresh recruits and reanimated bodies attack the turn they arrive, enabling alpha strikes
Mono-red consistency and access to cheap, efficient aggressive tribal creatures
Doubles as a haste enabler for big red bombs that happen to be Warriors/Berserkers
Anthem only buffs three creature types, so off-tribe support cards do nothing for the team
A single board wipe sets you back catastrophically with little recovery
Vulnerable to removal—killing Lovisa instantly shrinks your whole board and removes haste
Mono-red lacks card draw and struggles in long games against control/combo
No built-in evasion, so wide boards get gummed up by blockers
Provides reach and a payoff when creatures enter, closing games even through blockers.
Lean harder into a single tribe (Warriors are the deepest) so every lord and payoff stacks, and add evasion enablers like Bedlam or trample sources to stop board stalls. Improve resilience with recursion (Faithless Looting plus reanimation) and protection like Boros Charm or Heroic Intervention's red equivalents, and add card advantage via Skullclamp, Outpost Siege, and Valakut Awakening to refuel after wraths.